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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
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tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /macros/latex/contrib/lion-msc
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+@STRING{ADM="Adv. Mater."}
+@STRING{AO="Appl. Opt."}
+@STRING{APL="Appl. Phys. Lett."}
+@STRING{CPL="Chem. Phys. Lett."}
+@STRING{JAP="J. Appl. Phys."}
+@STRING{JJAP="Jpn. J. Appl. Phys."}
+@STRING{JCP="J. Chem. Phys."}
+@STRING{JMR="J. Mater. Res."}
+@STRING{JNCS="J. Non-Cryst. Sol."}
+@STRING{JOSA="J. Opt. Soc. Am."}
+@STRING{JOSAA="J. Opt. Soc. Am. A"}
+@STRING{JOSAB="J. Opt. Soc. Am. B"}
+@STRING{JVSTB="J. Vac. Sci. Technol. B"}
+@STRING{JVSTA="J. Vac. Sci. Technol. A"}
+@STRING{NL="Nano Lett."}
+@STRING{NAT="Nature"}
+@STRING{NMAT="Nature Materials"}
+@STRING{NPHYS="Nature Physics"}
+@STRING{NPHOT="Nature Photonics"}
+@STRING{NIMB="Nucl. Instr. Meth. B"}
+@STRING{ME="Microelectron. Eng."}
+@STRING{OC="Opt. Comm."}
+@STRING{OL="Opt. Lett."}
+@STRING{OM="Opt. Mat."}
+@STRING{OE="Opt. Expr."}
+@STRING{PR="Phys. Rev."}
+@STRING{PRA="Phys. Rev. A"}
+@STRING{PRB="Phys. Rev. B"}
+@STRING{PRD="Phys. Rev. D"}
+@STRING{PRE="Phys. Rev. E"}
+@STRING{PRL="Phys. Rev. Lett."}
+@STRING{PRSL="Proc. R. Soc. Lond. A"}
+@STRING{RSI="Rev. Sci. Instr."}
+@STRING{RMP="Rev. Mod. Phys."}
+@STRING{SCI="Science"}
+@STRING{TSF="Thin Solid Films"}
+
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+}
+
+@article{Peeters2008,
+abstract = {We demonstrate how the Maker fringes that are observable in spontaneous parametric down-conversion (SPDC) give a direct visualization of the poling quality of a periodically-poled crystal. Identical Maker fringes are observed in the optical spectrum of collinear SPDC and the temperature dependence of second harmonic generation. We analyze these Maker fringes via a unified treatment of the tuning curve in crystals with small and slowly-varying deformations of the poling structure. Our theoretical model, based on a Fourier analysis of the poling deformations, distinguishes between duty-cycle variations and variations of the poling phase. The analysis indicates that the poling phase is approximately fixed, while the duty-cycle typically varies between 36\% and 64\%.},
+author = {Peeters, W H and van Exter, M P},
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+title = {{Optical characterization of periodically-poled KTiOPO4.}},
+volume = {16},
+year = {2008}
+}
+
+@inbook{Greenberger1989,
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+ editor = {M. Kafatos},
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+}
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+
+
+@article{Assis2011,
+author = {de Assis, P.-L. and Carvalho, M. A. D. and Berruezo, L. P. and Ferraz, J. and Santos, I. F. and Sciarrino, F. and P\'{a}dua, S.},
+journal = {Optics Express},
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+title = {{Control of quantum transverse correlations on a four-photon system}},
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+
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+title = {{All-fiber source of frequency-entangled photon pairs}},
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+}
+
+@article{Simon2000,
+author = {Simon, C and Weihs, G and Zeilinger, A},
+journal = {Physical review letters},
+month = mar,
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+pages = {2993--6},
+pmid = {11018994},
+title = {{Optimal quantum cloning via stimulated emission}},
+volume = {84},
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+}
+
+@article{Kok2000,
+author = {Kok, Pieter and Braunstein, Samuel L.},
+journal = {Physical Review A},
+month = mar,
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+pages = 042304,
+title = {{Postselected versus nonpostselected quantum teleportation using parametric down-conversion}},
+volume = {61},
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+}
+
+
+
+@article{DiLorenzoPires2009,
+author = {{Di Lorenzo Pires}, H. and Monken, C. and van Exter, M. P.},
+journal = {Physical Review A},
+month = aug,
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+pages = 022307,
+title = {{Direct measurement of transverse-mode entanglement in two-photon states}},
+volume = {80},
+year = {2009}
+}
+
+
+@article{DAngelo2004,
+author = {D'Angelo, Milena and Kim, Yoon-Ho and Kulik, Sergei and Shih, Yanhua},
+journal = {Physical Review Letters},
+month = jun,
+number = {23},
+pages = 233601,
+title = {{Identifying Entanglement Using Quantum Ghost Interference and Imaging}},
+volume = {92},
+year = {2004}
+}
+
+@article{Eisaman2011,
+author = {Eisaman, M. D. and Fan, J. and Migdall, a. and Polyakov, S. V.},
+journal = {Review of Scientific Instruments},
+number = {7},
+pages = {071101},
+title = {{Invited Review Article: Single-photon sources and detectors}},
+volume = {82},
+year = {2011}
+}
+
+@article{Hadfield2009,
+author = {Hadfield, Robert H.},
+journal = {Nature Photonics},
+month = dec,
+number = {12},
+pages = {696--705},
+publisher = {Nature Publishing Group},
+title = {{Single-photon detectors for optical quantum information applications}},
+volume = {3},
+year = {2009}
+}
+
+@article{Ou1999,
+author = {Ou, Z. Y. and Rhee, J. K. and Wang, L. J.},
+journal = {Physical Review Letters},
+month = aug,
+number = {5},
+pages = {959--962},
+title = {{Observation of Four-Photon Interference with a Beam Splitter by Pulsed Parametric Down-Conversion}},
+volume = {83},
+year = {1999}
+}
+
+
+@article{Law2004,
+author = {Law, C. K. and Eberly, J. H.},
+journal = {Physical Review Letters},
+month = mar,
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+pages = 127903,
+title = {{Analysis and Interpretation of High Transverse Entanglement in Optical Parametric Down Conversion}},
+volume = {92},
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+}
+
+@article{Friberg1985,
+author = {Friberg, S. and Hong, C. K. and Mandel, L.},
+journal = {Physical Review Letters},
+number = {18},
+pages = {2011},
+title = {{Measurement of Time Delays in the Parametric Production of Photon Pairs}},
+volume = {54},
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+}
+
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+author = {O'Sullivan-hale, Malcolm N and Khan, Irfan Ali and Boyd, Robert W and Howell, John C},
+journal = {Physical Review Letters},
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+title = {{Pixel Entanglement: Experimental Realization of Optically Entangled d = 3 and d = 6 Qudits}},
+volume = {94},
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+}
+
+@article{Walborn2010,
+author = {Walborn, S.P. and Monken, C.H. and P\'{a}dua, S. and {Souto Ribeiro}, P.H.},
+journal = {Physics Reports},
+month = oct,
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+pages = {87--139},
+publisher = {Elsevier B.V.},
+title = {{Spatial correlations in parametric down-conversion}},
+volume = {495},
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+}
+
+@article{Howell2004,
+author = {Howell, John C. and Bennink, Ryan S. and Bentley, Sean J. and Boyd, R. W.},
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+author = {Strekalov, DV and Sergienko, AV and Klyshko, DN},
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+}
+
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+author = {Shi, B. -S. and Tomita, a.},
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+}
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+}
+
+@article{Riedmatten2004,
+author = {Riedmatten, Hugues De and Scarani, Valerio and Marcikic, Ivan and Ac\'{\i}n, Antonio and Tittel, Wolfgang and Zbinden, Hugo and Gisin, Nicolas},
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+volume = {51},
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+}
diff --git a/macros/latex/contrib/lion-msc/AlexanderPRA.tex b/macros/latex/contrib/lion-msc/AlexanderPRA.tex
new file mode 100644
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+\chapter{Spatially entangled 4-photons states from a periodically poled KTP crystal}
+
+\framebox[\textwidth]{
+\begin{minipage}[b]{.75\textwidth}
+\vskip 0.5em
+The contents of this chapter serve as an example and are based on a scientific paper published as Phys. Rev. A {\bf 85}, 043837 (2012). This article contains results from the master thesis of Alexander J.H. van der Torren. The results and data analysis of the original master theses have been reproduced, extended and improved by S. Cigdem Yorulmaz at a later stage.
+\vskip 0.5em
+\end{minipage}
+}
+
+\vskip 2em
+
+Photon pairs produced via spontaneous parametric down-conversion (SPDC) in a non-linear crystal give rise to strong nonclassical correlations. The resulting entangled photons are an important resource in quantum information, fundamental tests of quantum mechanics and have been used in experiments that demonstrate the violation of Bell's inequality, quantum teleportation and quantum communication. While most experiments focus on discrete polarization entanglement, quantum states of two particles that are entangled in continuous variables~\cite{Braunstein:RMP2005} such as frequency~\cite{Ou1988,Li2009}, time-bin~\cite{Friberg1985,Ou1999,Riedmatten2004} or photon momenta~\cite{Strekalov1995,Law2004,Howell2004,Walborn2010} are also possible, which gives access to high-dimensional entanglement that can be explored by measuring correlations between two photons.
+
+In this article, we focus on spatial entanglement using photon momenta as a continuous variable. Unlike other forms of continuous variable entanglement, the quantum correlations in spatial entanglement can be resolved with relative ease and high resolution by using a combination of lenses and apertures only. The low conversion efficiency in non-linear crystals combined with the long coherence time of a continuous wave pump and ultrashort coherence time of the photon pairs ensure that most experiments are well described by two-photon interference of individual pairs~\cite{Walborn2010}. As a consequence, spatial entanglement with more than two photons has remained elusive and spatial correlations beyond independent photon pairs have not been addressed in an experiment~\cite{Assis2011}. These multi-photon states are of interest since they provide access to non-trivial entanglement between more than two particles~\cite{Greenberger1989,Dur2000}. Furthermore, the generation rate of four photon states sets fundamental limits on the visibility achievable in two-photon interference experiments~\cite{Marcikic2002} and the maximum attainable key generation rate in quantum key distribution protocols.
+
+Here we investigate events where four spatially entangled photons are generated by SPDC. These four photons can either be two independent pairs, or they may all be in the same set of spatial and temporal modes to create a true four-photon state~\cite{Ou1999,Riedmatten2004}. The production of these four photon states is enhanced by the physical process of stimulated emission of a second photon pair into the same optical mode as the first pair. In the ideal situation of a single temporal and spatial mode, stimulated emission enhances the pair production rate by a factor of two compared to the probability to generate four photons in the same mode via two independent spontaneous processes. For a multi-mode situation, the relative importance of the stimulated emission process is given by a ``visibility'' $\chi$ that ranges from 0 to 1.
+
+The distinction between two independent pairs and four-photon states has been addressed in the time-domain using time-bin entanglement with a pulsed laser source~\cite{Ou1999,Riedmatten2004}. These experiments are restricted to a single spatial mode and therefore do not allow use of spatial degrees of freedom to explore the process of stimulated emission. The total number of modes is then given by the available temporal modes and is directly related to the frequency bandwidth of the SPDC light as compared to the frequency bandwidth of the pulsed laser source~\cite{Riedmatten2004}. To directly resolve the underlying mode structure requires a measurement of quantum correlations within a single laser pulse. Such a direct measurement of the arrival time would require detectors with high quantum efficiency and sub-picosecond timing resolution, which is well outside reach of current single-photon detector technology~\cite{Hadfield2009,Eisaman2011}. Instead, we use spatially entangled multi-photon states that allow us to resolve the fine structure of stimulated pairs emitted in a single laser pulse in a straightforward way. Using pinholes the momentum resolution in the far-field of the SPDC source may be made arbitrarily high. In an experiment, there is always a trade-off between the size of the pinhole and the collected signal, which sets the time required to measure coincidence rates to a sufficient level of accuracy.
+
+\section{Stimulated emission of spatially entangled 4-photon states}
+
+The downconversion process in the PPKTP crystal that generates photon pairs in $N$ spatial modes can be described by an interaction Hamiltonian of the SPDC process given by~\cite{Simon2000,Kok2000}:
+\begin{equation}
+H = \kappa \sum_{i}^N a^\dagger_{\vec{q_i}} a^\dagger_{\vec{-q_i}} + \mathrm{h.c.},
+\end{equation}
+where $a^\dagger_{\vec{q_i}}$ is the creation operator that creates a single photon in a spatial mode labeled by the transverse wavevector $\vec{q_i}$. The operator $a^\dagger_{\vec{q_i}} a^\dagger_{\vec{-q_i}}$ thus creates a pair of photons that is correlated in their transverse photon momenta and forms the basis for spatial entanglement. The parameter $\kappa$ describes the strength of the non-linear interactions and contains, among others, the (time-dependent) field of the pump and the effective non-linearity of the PPKTP crystal. For our purpose, where we pump the crystal with an intense pulsed laser, $\kappa$ can be assumed to be a classical quantity. The corresponding wavefunction of the state generated by SPDC can be directly obtained from the Hamiltonian:
+$$
+\ket{\Psi} = \exp(-i H \frac{t}{\hbar}) \ket{0} \approx (1-\frac{i t}{\hbar} H - \frac{t^2}{2 \hbar^2} H^2) \ket{0},
+$$
+where we limited the Taylor expansion in the last step to exclude quantum states with more than 4 photons. The linear term in the Taylor expansion creates a state $\ket{\Psi_2}$ that consists of a superposition of a single photon pair in any of the available spatial modes:
+$$
+\ket{\Psi_2} = \frac{- i t}{\hbar}H \ket{0} = \frac{- i \kappa t}{\hbar} \sum_{i=1}^N \ket{1_{\vec{q_i}};1_{\vec{-q_i}}}.
+$$
+Please note that we use a shorthand notation in which we leave out all spatial modes without a photon. The spatial modes that contain photons are numbered by the number of photons in that mode and the subscript refers to the transverse photon momentum of that mode. The quadratic term gives rise to a state $\ket{\Psi_4}$ with 4 photons that contains all double pair contributions, which can be represented using the same notation~\cite{Riedmatten2004} as
+\begin{eqnarray*} \ket{\Psi_4} & = & \frac{- \kappa^2 t^2}{2 \hbar^2} \bigg( 2 \sum_{i=1}^N \ket{2_{\vec{q_i}};2_{\vec{-q_i}}} + \\ & & \sum_{i=1}^N \sum_{j=1, i \neq j}^{N} \ket{1_{\vec{q_i}},1_{\vec{q_j}};1_{\vec{-q_i}},1_{\vec{-q_j}}} \bigg).
+\end{eqnarray*}
+The effect of stimulated emission follows directly from the creation operators and is contained in the extra factor $\sqrt{2}$ when two photon pairs are created in the same spatial mode.
+
+A measurement of a single photon in a particular spatial mode with wavevector $\vec{q_i}$ determines the wavevector of the twin photon and corresponds to a state projection: $a_{\vec{q_i}}\ket{\Psi}$. The state projection allows us to calculate the probabilities of creating a single photon pair $P_2$ as well as the probability $P_4$ to create a state with 4 photons in the same mode. For a single spatial and temporal mode, the probability $P_4$ is exactly equal to $P_2^2$ and is thus enhanced by a factor 2 compared to stimulated emission of two photon pairs in the same spatial modes. In a situation with more than one spatial mode, which is of interest here, stimulated emission enhances the probability $P_4$ by a factor $(1+\chi)$, where $\chi$ is a ``visibility'' from 0 to 1 that quantifies the extra contribution to the 4 photon states due to stimulated emission. The probability to create a 4 photon state with the photons in the same mode can then be expressed as~\cite{Riedmatten2004}:
+\begin{equation}
+P_4 = \frac{P_2^2}{2} (1+\chi).
+\end{equation}
+
+\section{Experimental investigation of 4-photon quantum correlations}
+
+\subsection{Experiment}
+
+\begin{figure}[tbp]
+\centering \includegraphics[width=120mm]{Fig1.png}
+\caption{(Color online) Setup to measure spatially entangled 4-photon states via parametric downconversion in a 2 mm PPKTP crystal. UV pump pulses from a frequency doubled Ti:Sapphire laser are focused by lens L1 ($f_1$~=~250~mm). Photons are collected by the lenses $L2$ ($f_2$~=~270~mm) and detected by the detector assemblies $D1-D3$ that use photon counting APDs to detect single photons in a particular direction defined by the apertures $A$ placed in the combined focal planes of $L2$ and $L3$ ($f_3$~=~4.5~mm). The beamsplitter, $BS$, allows to record if two photons are in the same spatial mode. To this end detector assemblies $D1$ and $D2$ are placed on computer controlled translation stages. Correlations in the coincidence events are due to 4-photon states that are created by the process of stimulated emission of photon pairs.} \label{Fig:setup}
+\end{figure}
+
+Figure~\ref{Fig:setup} depicts the setup to explore the spatial quantum correlations due to stimulated emission of pairs in a four-photon state. In order to get a non-negligible rate of double pairs we use a highly efficient, 2 mm long, periodically poled KTP (PPKTP) crystal~\cite{Peeters2008} pumped by $\sim$100 mW of 413.2 nm pulsed laser light. The pulsed laser in our setup produces 2 ps pulses and is focussed into the PPKTP crystal using a lens $L1$, with a focal length $f$ of 250~mm. The source creates non-colinear, frequency degenerate photon pairs at a wavelength of 826.4 nm that are filtered by a bandpass filter $F$ and collected by lenses $L2$ ($f$~=~270~mm). Three detector assemblies $D1-D3$ are used to collect single photons with a well-defined momentum. Each of these assemblies consists of a lens $L3$ ($f_3$~=~4.5~mm), an aperture $A$ placed in the far-field to select the photon momentum and a (multi-mode) fiber-coupled single photon counting avalanche photodiode (Perkin-Elmer SPCM-AQ4C). The mode diameter of the fiber used in the experiments is $50$~$\mu$m and lenses $L2$ and $L3$ provide a 60$\times$ magnification factor. Coincidence detection with a $\sim$1.7~ns coincidence window between the detectors $D1$ and $D3$ (or $D2$ and $D3$) results in a measurement of spatial entanglement of single pairs. The beamsplitter, $BS$, allows us to record coincidence events between detectors $D1$ and $D2$ that are due to two photons from different pairs. To record the spatial correlations both detector assemblies $D1$ and $D2$ are placed on computer controlled translation stages that allow movement in the $x$ and $y$ directions transverse to the optical beam.
+
+The essential feature of the setup is that it allows us to distinguish a genuine 4-photon state from two independent pairs by detecting coincidences between two photons in the same arm, as was introduced earlier for 4-photon states in the time-domain~\cite{Riedmatten2004}. In this setup only the 4-photon states created by stimulated emission generate strong correlations between detectors $D1$ and $D2$, while double pair states do not create any special correlations.
+
+The length of the 2~ps laser pulse is a compromise between a short laser pulse to select a single temporal mode on the one hand and a somewhat longer laser pulse to retain efficient SPDC on the other hand. For a very short laser pulse the photons are created at a well-defined time, but the SPDC process becomes inefficient due to the broad spectral content of the laser pulse. In our study, the combination of the pulse duration and the bandpass filter selects $\sim$3 temporal modes, leading to a maximum possible visibility $\chi$=0.5 for a single spatial mode. The choice of the pulse duration and the length of the crystal was motivated by the group velocity walk-off length $L_g$ = 1.5 mm, calculated for transform-limited pulses, being comparable to the crystal length. Under those conditions, the phase-matching in the crystal is only mildly affected by the pulsed laser and all frequency components of the laser pulse contribute to the efficient generation of SPDC light.
+
+% I calculated the GV walk-off length as \tau/|D|, with d=0.4/c and \tau=2 ps.
+
+\subsection{Quantum correlations at the two-photon level and number of Schmidt modes}
+
+\begin{figure}[tbp]
+\centering \includegraphics[width=120mm]{Fig2.png}
+\caption{(Color online) Measured single count rates $R_2$ (open symbols) and 2-fold coincidence rates $R_{23}$ (filled symbols) as a function of position $x_2$, demonstrating spatial correlations in the two-photon field. The pulsed laser beam was focused in the center of the crystal using a $f$~=~250~mm lens. Data are collected using a 1 nm FWHM bandpass filter and a 1.5~mm aperture in the far-field. The solid and dashed lines indicate Lorentzian and Gaussian fits to the single and coincidence rates, respectively. The inset shows a far field image of the SPDC light emitted by the PPKTP crystal at a temperature of 20~$^\circ$C. The approximate positions of detectors D2 and D3 are shown by circles on the ring.} \label{Fig:2photons}
+\end{figure}
+
+Figure~\ref{Fig:2photons} shows the measured coincidence rate between detectors $D2$ and $D3$ (solid symbols, left axis) as a function of the position $x_2$ of detector $D_2$. Detector assembly $D_3$ is positioned at a fixed position and collects photons at an angle of -50 mrad in the far-field of the source. The measured coincidences, corrected for accidental events, are compared to the measured single count rate on detector $D2$ (open symbols, right axis). The measured single count rate on detector $D_3$ is $\sim3\cdot10^{5}$~$s^{-1}$ and is constant throughout the experiment.
+
+The single count rate as a function of detector position is well described by a Lorentzian fit (solid line) centered at a position of 50$\pm$5~mrad and a width of 14.9$\pm$0.5~mrad FWHM. Please note that the uncertainty in the stated center position is due to the fact that it is difficult to determine the absolute position of lens $L2$ on the optical table. The characteristic minima of the $\mathrm{sinc}^2$ phase-matching curve commonly observed under continuous wave pumping are 'averaged' out by the multiple frequencies available in the spectrum of the picosecond pulsed laser~\cite{Keller1997}. The measured two-fold coincidence rate as a function of the position $x_2$ of the detector is well described by a Gaussian (dashed line) with a width (FWHM) of 5.1$\pm$0.1~mrad, and a center position of 50$\pm$5~mrad. The observation that the peak in coincidence rate is much narrower than the measured singles is a clear signature of two-photon correlations in a high-dimensional Hilbert space. The ratio of the width of the singles versus the coincidences is a direct measure of the Schmidt number $K_r$ of the (radial) spatial entanglement generated in the PPKTP crystal~\cite{DiLorenzoPires2009}. Based on the measured width of the coincidence and singles peak, we estimate a Schmidt number $K_{exp}$~$\approx$~2.9$\pm$0.1 for the pulsed laser. This estimate should be converted to a two-dimensional Schmidt number in order to compare this number to values given in literature for continuous wave pumping.
+
+To this end, we introduce a second azimuthal Schmidt number $K_\phi$, being the ratio of the circumference of the SPDC ring, i.e. 2$\pi \times$50~mrad, over the measured width of the coincidence peak. This results in $K_\phi$~$\approx$60$\pm$6 and a corresponding Schmidt number $K$~=~$K_r K_\phi$~$\approx$~175$\pm$20. This number should be compared to calculated values~\cite{Law2004} and experimental values obtained for a 5.0~mm crystal pumped by a continuous wave laser~\cite{DiLorenzoPires2009}. The value of $K$ from ref.~\cite{DiLorenzoPires2009} for strongly negative phase mismatch (i.e. an open SPDC ring) was scaled to our case by taking into account the differences in pump beam waist and crystal length. Based on this, we expect a two-dimensional Schmidt number of $\sim$125. This value is somewhat lower than the value stated above, which we attribute to the fact that we neglected the effect of the pulsed laser on the width of the SPDC ring. The pulsed laser contains many pump frequencies which gives a slightly broader ring and consequently causes an overestimate of the value of $K_r$.
+
+\subsection{Observation of quantum correlations of 4-photon states in the spatial degrees of freedom}
+
+To explore the contribution of stimulated emission we measure the coincidence rate $R_{21}$ between detectors $D1$ and $D2$. Coincidences can only be registered if at least four photons are generated by a single photon pulse, since only one-photon in each pair produced by SPDC can be detected. The measured coincidence rate for photons originating from the same pulse contains both stimulated and spontaneous events. To get a measure of the number of coincidences due to spontaneous emission we introduce a tunable electronic delay between detectors $D1$ and $D2$. This allows a measurement of the coincidences in the same laser pulse ($R_{21}^{0\mathrm{ns}}$) as well as the coincidence events between subsequent laser pulses by setting the electronic delay to 12~ns ($R_{21}^{12\mathrm{ns}}$). This latter coincidence rate is dominated by events where a single pair is produced in each of the laser pulses and the coincidence rate $R_{21}^{12\mathrm{ns}}$ thus represents only the coincidence rate due to two spontaneously emitted photon pairs.
+
+\begin{figure}[tbp]
+\centering \includegraphics[width=87mm]{Fig3a.png} \\
+\centering \includegraphics[width=87mm]{Fig3b.png}
+\caption{(Color) Measured joint spatial distribution of stimulated pair emission. (a) False-color plot of the measured difference in coincidence rate $(R_{21}^{0\mathrm{ns}} - R_{21}^{12\mathrm{ns}})$ as a function of the positions of $x_1$ and $x_2$ of detectors $D_1$ and $D_2$. Data are collected with a 5~nm FWHM bandpass filter and a 1.5~mm aperture size. The observed maximum coincidence rate $(R_{21}^{0\mathrm{ns}}$ is typically 25,000~s$^{-1}$. The data clearly demonstrate that stimulated pair emission occurs when the photons are emitted in the same spatial mode, i.e. when $x_1$~=~$x_2$. (b) Visibility $\chi$ of the 4-photon state as a function of position $x_2$. The different symbols (triangles, circles, squares) correspond to different positions $x_1$ (44.4, 50.0, 55.6~mrad) of detector $D_1$. Data are collected using a 1~nm FWHM bandpass filter and a 1.5 mm aperture. The solid lines through the data are Gaussian fits.}\label{Fig:4photon}
+\end{figure}
+
+The difference in these coincidence rates, normalized by the coincidence rate due to spontaneous events is equal to the ``visibility'' $\chi$, i.e. $\chi = (R_{21}^{0\mathrm{ns}} - R_{21}^{12\mathrm{ns}})/R_{21}^{12\mathrm{ns}}$ and is a good measure of the extra events due to stimulated emission of 4-photon states. The measured visibility as a function of the position of the two detectors, $\chi(x_1,x_2)$, can be interpreted as a joint spatial density of stimulated pair emission. This joint spatial distribution of stimulated pair emission is depicted in Fig~\ref{Fig:4photon}. The false colour image in Fig.~\ref{Fig:4photon}a shows the difference in coincidence rate $(R_{21}^{0\mathrm{ns}} - R_{21}^{12\mathrm{ns}})$ as a function of the position $x_1$ and $x_2$ of detectors $D1$ and $D_2$ using a 5~nm bandpass filter for the SPDC light. The image is centered around the point $x_1$~=~$x_2$~=~50~mrad and clearly shows the expected positive correlation due to stimualted emission of the 4-photon state that leads to extra coincidences whenever the two detectors detect photons in the same optical mode, i.e. when $x_1$~=~$x_2$. The width (FWHM) of the peak along the diagonal ($x_1-x_2$~=~0~mrad) is 11.5$\pm$0.3 mrad, while the width along the anti-diagonal direction ($x_1+x_2$~=~100~mrad) is 4.5$\pm$0.1 mrad.
+
+Figure~\ref{Fig:4photon}b shows the visibility $\chi(x_1,x_2)$ as a function of position $x_2$ of detector $D2$ for a fixed position of detector $D1$. The three curves correspond to $x_1$~=~44.4~mrad (triangles), 50.0~mrad (circles) and 55.6~mrad (squares). These data are taken with a 1~nm bandpass filter for the SPDC light in order to enhance the visibility at the expense of a much lower count rate. The narrow band frequency filter lowers the number of temporal modes involved, but does not affect the spatial modes. The integration time per point was increased by repeated scanning of the detector in the $x_2$ direction. Because the phase-mismatch of the PPKTP crystal that governs the SPDC process depends weakly on laser power, the long term stability of the laser becomes important. In order to correct for this effect we also monitor the single counts on the detector $D2$ as a function of position $x_2$ and exclude scans from our analysis where the SPDC ring appears shifted. The solid lines through the data are Gaussian fits to the data with a FWHM width of 8.9$\pm$0.3. The peak positions are shifted to the position of detector $D1$, such that the peak of the Gaussian appears at $x_1$~=~$x_2$. The obtained peak visibilities for the three curves are 0.13$\pm$0.01, 0.16$\pm$0.01 and 0.12$\pm$0.01. For a uniform illumination of the aperture one would expect the peak visibility to be independent of the position $x_1$. This case corresponds to a situation where the width of the SPDC ring, as given by the phase-matching function, is much larger than the shift in position $x_1$. In our experiment the slightly lower visibility for $x_1$~=~44.4 and 55.6~mrad is caused by the finite diameter of the 1.5~mm aperture that captures a non-uniform part of the SPDC ring. For larger apertures (data not shown) this decrease in visibility indeed becomes more significant.
+
+The visibility in our experiment is limited by both the number of temporal modes collected as well as by the ratio of the total number of spatial modes available over the number of spatial modes collected by the aperture. The total number of temporal modes generated is given by the frequency bandwidth of the SPDC light as compared to the frequency spread of the pulse. For a Fourier limited pulse shape the frequency bandwidth is related to the pulse duration via $\tau = (2 \ln(2) \lambda^2)/(/\pi c \Delta \lambda)$, where $\tau$ is the pulse duration and $\lambda/\Delta \lambda$ is the relative frequency spread. The 2~ps pulse corresponds to an equivalent spectral width of 0.5~nm, while the 2~mm PPKTP crystal produces SPDC light with a bandwidth of $\sim$40 nm FWHM. Consequently, the number of available temporal modes for a PPKTP crystal pumped by a 2~ps laser is pulse is potentially $\sim$80. We use '5 nm' and '1 nm' bandpass filters centered at 826.4 nm to limit the number of temporal modes. The measured FWHM bandwidth of these filters is 4.6~nm and 1.5~nm, which extends the coherence time of the SPDC light and limit the number of temporal modes to $\sim$9 and $\sim$3 respectively. Since $\chi$ is inversely proportional to the number of available temporal modes~\cite{Riedmatten2004}, this produces upper limits to $\chi$ of 0.1 and 0.3 for the two bandpass filters. We stress that shorter pump pulses do not necessarily lead to a higher flux of photons since the phase-matching in the 2~mm PPKTP crystal effectively filters the pump pulse. In our experiments we have carefully chosen the crystal length to maximize conversion efficiency without significantly stretching the pump pulse to avoid a non-factorable structure ('X-entanglement') between spatial and temporal degrees of freedom~\cite{Gatti:PRL2009}.
+
+\begin{figure}[tbp]
+\centering \includegraphics[width=87mm]{Fig4.png}
+\caption{(Color online) Visibility $\chi$ of the 4-photon state as a function of aperture size using a 1~nm FWHM bandpass filter (triangles) and a 5~nm FWHM bandpass filter (circles). These data are obtained by subtracting the measured coincidence rate at a delay of 12~ns from the measured coincidence rate at zero delay. Typical single count rates on the detector are $1.4\times10^6$ and $3\times10^5$ sec$^{-1}$ for apertures $>$ 2 mm and drop to $5\times10^5$ and $1\times10^5$ sec$^{-1}$ for a 1 mm aperture size. The solid lines represent a calculation with no free parameters (see text). For apertures larger than 2 mm, the aperture is limited by lens $L3$ and the numerical aperture of the fiber and the visibility saturates as indicated by the horizontal dashed lines. The inset shows the measured coincidence rate $R_{12}$ as a function of electronic delay for a 1~nm FWHM bandpass filter and a 1~mm aperture size ($\chi$~=~0.25), indicated by the arrow.}\label{Fig:Visibility}
+\end{figure}
+
+Figure~\ref{Fig:Visibility} shows the measured visibility as a function of aperture size for a 5~nm bandpass filter (circles) as compared to a 1~nm bandpass filter (triangles). Measurements were performed by measuring coincidence rates between detectors $D1$ and $D2$ at a fixed position $x_1$~=~$x_2$~=~50~mrad. A measurement of the coincidence rate as a function of the electronic time delay is shown in the inset for a point with a relatively high visibility of 0.25. The extra 50 counts/sec at zero delay are due to stimulated emission of photon pairs. Clearly, the visibility is low and nearly constant for apertures that are larger than 2~mm and rises as the number of available spatial modes is reduced by closing the aperture. In our experiments the visibility saturates at apertures sizes above 2 mm where the apertures size is limited by the finite numerical aperture of the multimode fiber in combination with the focal length of the fiber coupling lens $L3$. The saturation is represented by the horizontal dashed lines.
+
+The visibility $\chi$ in the experiment is proportional to the inverse of the number of spatial and temporal modes, i.e. $\chi \propto N_t^{-1} N_{sp}^{-1}$, where $N_t$ and $N_{sp}$ are the number of temporal and spatial modes respectively. Throughout the experiment $N_t$ is determined by the FWHM of the bandpass filter and can be considered constant. We use values of $N_t$ = 9 and $N_t$ = 3 for the two different bandpass filters. In order to estimate the number of spatial modes collected as a function of aperture size we consider the correlations between two point-like apertures at positions $\vec{r_1}$ and $\vec{r_2}$. The resulting visibility is given by:
+\begin{equation}
+\chi(\vec{r_1},\vec{r_2})=\exp(-\frac{|\vec{r_1}-\vec{r_2}|^2}{r_0^2}).
+\end{equation}
+The characteristic distance $r_0 = (\lambda f_2)/(\pi w_p)$, where $f_2$ = 270 mm is the focal distance of lens $L2$ that creates the far-field of the SPDC source and $w_p$ is the waist of the pump beam created by focussing the pump beam using lens $L1$. Using the measured waist of the pump beam of 80~$\mu$m we find a characteristic distance $r_0$~=~0.9 mm. The visibility in the experiment due to finite aperture size for two apertures centered at the same position can be found via integration:
+\begin{equation}
+ \chi (a) = \frac {1}{N_t \pi^2 a^4} \iint \chi(\vec{r_1},\vec{r_2}) \Theta(|\vec{r_1}|-a) \Theta(|\vec{r_2}|-a) \mathrm{d}\vec{r_1} \mathrm{d}\vec{r_2}, \label{vis}
+\end{equation}
+where the Heaviside step-functions $\Theta(|\vec{r_1}|-a)$ and $\Theta(|\vec{r_2}|-a)$ represent the sharp edges of the two apertures with equal radius $a$ in the far-field. The solid lines through the data in Fig.~\ref{Fig:Visibility} are the results of calculating the double integral represented by equation~\ref{vis} using 3 and 9 temporal modes for the two bandpass filters and the calculated value of $r_0$ based on the measured beam waist. The agreement between the data and the model with no adjustable parameters is striking for aperture sizes below 2 mm. For apertures above 2 mm the visibility saturates, as indicated by the horizontal dashed lines, at a value determined by lens $L3$ and the numerical aperture of the multimode fiber that limit the beam diameter to $\sim$2~mm.
+
+\section{Conclusion}
+
+In conclusion, we have demonstrated the existence of spatial correlations between photon pairs in a 4-photon state. These correlations are induced via stimulated pair emission. In our experiments we are able to separate the contribution from spontaneous parametric down-conversion and stimulated parametric down-conversion at the level of double pairs. The stimulated emission becomes important when a 2~mm long PPKTP crystal is pumped by a 2~ps pulsed laser at 413.2~nm wavelength to create frequency and polarization degenerate photon pairs at a wavelength of 826.4~nm. The spatial correlations of the stimulated photon pairs contains a rich structure when using a non-colinear geometry for the down-conversion process, which can be explored with relative ease using apertures in the far-field. In this way we present the first measurements of the joint spatial distribution of stimulated pair emission and discuss the acquired visibility. This technique opens new possibilities to explore the structure of higher-dimensional entanglement by making use of spatial degrees of freedom instead of the temporal degree of freedom. The possibility to distinguish between stimulated and spontaneous processes can be used to explore recent proposals for ghost imaging with thermal and quantum light sources\cite{Chan:PRA2009,Osullivan:PRA2010}.
+
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@@ -0,0 +1,674 @@
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+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
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+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+
+ {one line to give the program's name and a brief idea of what it does.}
+ Copyright (C) {year} {name of author}
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+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+
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+ along with this program. If not, see <http://www.gnu.org/licenses/>.
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+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ {project} Copyright (C) {year} {fullname}
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
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+
+ The GNU General Public License does not permit incorporating your program
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+may consider it more useful to permit linking proprietary applications with
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+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/macros/latex/contrib/lion-msc/README.md b/macros/latex/contrib/lion-msc/README.md
new file mode 100644
index 0000000000..5cda0c1dff
--- /dev/null
+++ b/macros/latex/contrib/lion-msc/README.md
@@ -0,0 +1,19 @@
+# lion-msc
+LaTeX class for B.Sc. and M.Sc. reports at Leiden Institute of Physics (LION).
+
+The purpose of this class is twofold: It creates a uniform layout of the
+student theses from our department. More importantly it contains several
+fields on the front-page that the user needs to fill that are used in the
+university administration (name, student number and name of supervisor)
+
+Students are free to change the layout of the text but should leave the
+title page as it is.
+
+The complete documentation is provided in lion-msc.pdf.
+
+The minimal.tex file is an empty template.
+
+
+author: Michiel de Dood <dood@physics.leidenuniv.nl>
+
+Copyright (C) 2014-17 by M.J.A. de Dood
diff --git a/macros/latex/contrib/lion-msc/lion-msc-logo.pdf b/macros/latex/contrib/lion-msc/lion-msc-logo.pdf
new file mode 100644
index 0000000000..841e1e8158
--- /dev/null
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+/CreationDate (Mon Dec 3 16:05:40 2001)
+/Producer (PStill 1.52 by F.Siegert frank@this.net)
+/Title (_LogoULsolo_eps_)
+>>
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+trailer
+<<
+/Size 10
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+/Info 8 0 R
+>>
+startxref
+44464
+%%EOF
diff --git a/macros/latex/contrib/lion-msc/lion-msc.bst b/macros/latex/contrib/lion-msc/lion-msc.bst
new file mode 100644
index 0000000000..4df042d0ad
--- /dev/null
+++ b/macros/latex/contrib/lion-msc/lion-msc.bst
@@ -0,0 +1,949 @@
+
+ % 2014 Renamed and reused as lion-msc.bst
+ % 2002 Modified bibliography style by M.J.A. de Dood for PhD thesis
+
+ % Original file was aip.bst; bibliography style for AIP journals
+
+ % Please notify Charles Karney (Karney@Princeton.EDU)
+ % of any bugs, improvements, etc.
+
+ % For American Institute of Physics Journals
+
+ % version 0.99b for BibTeX versions 0.99a or later, LaTeX version 2.09.
+ % Copyright (C) 1985, all rights reserved.
+ % Copying of this file is authorized only if either
+ % (1) you make absolutely no changes to your copy, including name, or
+ % (2) if you do make changes, you name it something other than
+ % btxbst.doc, plain.bst, unsrt.bst, alpha.bst, and abbrv.bst.
+ % This restriction helps ensure that all standard styles are identical.
+ % The file btxbst.doc has the documentation for this style.
+
+ENTRY
+ { address
+ author
+ booktitle
+ chapter
+ edition
+ editor
+ howpublished
+ institution
+ journal
+ key
+ month
+ note
+ number
+ organization
+ pages
+ publisher
+ school
+ series
+ title
+ type
+ volume
+ year
+ }
+ {}
+ { label }
+
+INTEGERS { output.state before.all mid.sentence after.sentence after.block }
+
+FUNCTION {init.state.consts}
+{ #0 'before.all :=
+ #1 'mid.sentence :=
+ #2 'after.sentence :=
+ #3 'after.block :=
+}
+
+STRINGS { s t }
+
+FUNCTION {output.nonnull}
+{ 's :=
+ output.state mid.sentence =
+ { ", " * write$ }
+ { output.state after.block =
+ { "," * write$
+ newline$
+ "\newblock " write$
+ }
+ { output.state before.all =
+ 'write$
+ { add.period$ " " * write$ }
+ if$
+ }
+ if$
+ mid.sentence 'output.state :=
+ }
+ if$
+ s
+}
+
+FUNCTION {output}
+{ duplicate$ empty$
+ 'pop$
+ 'output.nonnull
+ if$
+}
+
+FUNCTION {output.check}
+{ 't :=
+ duplicate$ empty$
+ { pop$ "empty " t * " in " * cite$ * warning$ }
+ 'output.nonnull
+ if$
+}
+
+FUNCTION {output.bibitem}
+{ newline$
+ "\bibitem{" write$
+ cite$ write$
+ "}" write$
+ newline$
+ ""
+ before.all 'output.state :=
+}
+
+FUNCTION {fin.entry}
+{ add.period$
+ write$
+ newline$
+}
+
+FUNCTION {new.block}
+{ output.state before.all =
+ 'skip$
+ { after.block 'output.state := }
+ if$
+}
+
+FUNCTION {new.sentence}
+{ skip$
+}
+
+FUNCTION {not}
+{ { #0 }
+ { #1 }
+ if$
+}
+
+FUNCTION {and}
+{ 'skip$
+ { pop$ #0 }
+ if$
+}
+
+FUNCTION {or}
+{ { pop$ #1 }
+ 'skip$
+ if$
+}
+
+FUNCTION {new.block.checka}
+{ empty$
+ 'skip$
+ 'new.block
+ if$
+}
+
+FUNCTION {new.block.checkb}
+{ empty$
+ swap$ empty$
+ and
+ 'skip$
+ 'new.block
+ if$
+}
+
+FUNCTION {new.sentence.checka}
+{ empty$
+ 'skip$
+ 'new.sentence
+ if$
+}
+
+FUNCTION {new.sentence.checkb}
+{ empty$
+ swap$ empty$
+ and
+ 'skip$
+ 'new.sentence
+ if$
+}
+
+FUNCTION {field.or.null}
+{ duplicate$ empty$
+ { pop$ "" }
+ 'skip$
+ if$
+}
+
+FUNCTION {emphasize}
+{ duplicate$ empty$
+ { pop$ "" }
+ { "{\em " swap$ * "}" * }
+ if$
+}
+
+FUNCTION {embolden}
+{ duplicate$ empty$
+ { pop$ "" }
+ { "{\bf " swap$ * "}" * }
+ if$
+}
+
+FUNCTION {paren}
+{ duplicate$ empty$
+ { pop$ "" }
+ { "(" swap$ * ")" * }
+ if$
+}
+
+INTEGERS { nameptr namesleft numnames }
+
+INTEGERS { etal }
+
+FUNCTION {format.names}
+{ 's :=
+ #1 'nameptr :=
+ s num.names$ 'numnames :=
+ numnames #20 >
+ s numnames "{ll}" format.name$ "others" = numnames #1 > and
+ or 'etal :=
+ etal
+ { #1 #1 + 'namesleft := }
+ { numnames 'namesleft := }
+ if$
+ { namesleft #0 > }
+ { s nameptr "{f.~}{vv~}{ll}{, jj}" format.name$ 't :=
+ nameptr #1 >
+ { namesleft #1 >
+ { ", " * t * }
+ { nameptr #2 >
+ { "," * }
+ 'skip$
+ if$
+ t "others" =
+ etal or
+ { " et~al." * }
+ { " and " * t * }
+ if$
+ }
+ if$
+ }
+ 't
+ if$
+ nameptr #1 + 'nameptr :=
+ namesleft #1 - 'namesleft :=
+ }
+ while$
+}
+
+FUNCTION {format.authors}
+{ author empty$
+ { "" }
+ { author format.names }
+ if$
+}
+
+FUNCTION {format.editors}
+{ editor empty$
+ { "" }
+ { editor format.names
+ editor num.names$ #1 >
+ { ", editors" * }
+ { ", editor" * }
+ if$
+ }
+ if$
+}
+
+FUNCTION {format.edited}
+{ editor empty$
+ { "" }
+ { "edited by " editor format.names * }
+ if$
+}
+
+FUNCTION {format.title}
+{ title empty$
+ { "" }
+ { title emphasize "t" change.case$ }
+ if$
+}
+
+FUNCTION {n.dashify}
+{ 't :=
+ ""
+ { t empty$ not }
+ { t #1 #1 substring$ "-" =
+ { t #1 #2 substring$ "--" = not
+ { "--" *
+ t #2 global.max$ substring$ 't :=
+ }
+ { { t #1 #1 substring$ "-" = }
+ { "-" *
+ t #2 global.max$ substring$ 't :=
+ }
+ while$
+ }
+ if$
+ }
+ { t #1 #1 substring$ *
+ t #2 global.max$ substring$ 't :=
+ }
+ if$
+ }
+ while$
+}
+
+FUNCTION {first.page}
+{ 't :=
+ ""
+ { t empty$ not t #1 #1 substring$ "-" = not and }
+ { t #1 #1 substring$ *
+ t #2 global.max$ substring$ 't :=
+ }
+ while$
+}
+
+FUNCTION {format.date}
+{ year empty$
+ { "" }
+ 'year
+ if$
+}
+
+FUNCTION {format.btitle}
+{ title emphasize
+}
+
+FUNCTION {tie.or.space.connect}
+{ duplicate$ text.length$ #3 <
+ { "~" }
+ { " " }
+ if$
+ swap$ * *
+}
+
+FUNCTION {either.or.check}
+{ empty$
+ 'pop$
+ { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+ if$
+}
+
+FUNCTION {format.bvolume}
+{ volume empty$
+ { "" }
+ { "volume" volume tie.or.space.connect
+ series empty$
+ 'skip$
+ { " of " * series emphasize * }
+ if$
+ "volume and number" number either.or.check
+ }
+ if$
+}
+
+FUNCTION {format.number.series}
+{ volume empty$
+ { number empty$
+ { series field.or.null }
+ { output.state mid.sentence =
+ { "number" }
+ { "Number" }
+ if$
+ number tie.or.space.connect
+ series empty$
+ { "there's a number but no series in " cite$ * warning$ }
+ { " in " * series * }
+ if$
+ }
+ if$
+ }
+ { "" }
+ if$
+}
+
+FUNCTION {format.edition}
+{ edition empty$
+ { "" }
+ { output.state mid.sentence =
+ { edition "l" change.case$ " edition" * }
+ { edition "t" change.case$ " edition" * }
+ if$
+ }
+ if$
+}
+
+INTEGERS { multiresult }
+
+FUNCTION {multi.page.check}
+{ 't :=
+ #0 'multiresult :=
+ { multiresult not
+ t empty$ not
+ and
+ }
+ { t #1 #1 substring$
+ duplicate$ "-" =
+ swap$ duplicate$ "," =
+ swap$ "+" =
+ or or
+ { #1 'multiresult := }
+ { t #2 global.max$ substring$ 't := }
+ if$
+ }
+ while$
+ multiresult
+}
+
+FUNCTION {format.pages}
+{ pages empty$
+ { "" }
+ { pages multi.page.check
+ { "pages" pages n.dashify tie.or.space.connect }
+ { "page" pages tie.or.space.connect }
+ if$
+ }
+ if$
+}
+
+FUNCTION {format.pages.a}
+{ pages empty$
+ { "" }
+ { "page" pages first.page tie.or.space.connect }
+ if$
+}
+
+FUNCTION {format.vol.num.pages}
+{ volume field.or.null embolden
+ " " swap$ * *
+ pages empty$
+ 'skip$
+ { duplicate$ empty$
+ { pop$ format.pages.a }
+ { ", " * pages first.page * }
+ if$
+ }
+ if$
+}
+
+FUNCTION {format.chapter.pages}
+{ chapter empty$
+ 'format.pages
+ { type empty$
+ { "chapter" }
+ { type "l" change.case$ }
+ if$
+ chapter tie.or.space.connect
+ pages empty$
+ 'skip$
+ { ", " * format.pages * }
+ if$
+ }
+ if$
+}
+
+FUNCTION {format.in.ed.booktitle}
+{ booktitle empty$
+ { "" }
+ { editor empty$
+ { "in " booktitle emphasize * }
+ { "in " booktitle emphasize * ", " * format.edited * }
+ if$
+ }
+ if$
+}
+
+FUNCTION {empty.misc.check}
+{ author empty$ title empty$ howpublished empty$
+ month empty$ year empty$ note empty$
+ and and and and and
+ { "all relevant fields are empty in " cite$ * warning$ }
+ 'skip$
+ if$
+}
+
+FUNCTION {format.thesis.type}
+{ type empty$
+ 'skip$
+ { pop$
+ type "t" change.case$
+ }
+ if$
+}
+
+FUNCTION {format.tr.number}
+{ type empty$
+ { "Technical Report" }
+ 'type
+ if$
+ number empty$
+ { "t" change.case$ }
+ { number tie.or.space.connect }
+ if$
+}
+
+FUNCTION {format.article.crossref}
+{ key empty$
+ { journal empty$
+ { "need key or journal for " cite$ * " to crossref " * crossref *
+ warning$
+ ""
+ }
+ { "In " journal * }
+ if$
+ }
+ { "In " key * }
+ if$
+ " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.crossref.editor}
+{ editor #1 "{vv~}{ll}" format.name$
+ editor num.names$ duplicate$
+ #2 >
+ { pop$ " et~al." * }
+ { #2 <
+ 'skip$
+ { editor #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
+ { " et~al." * }
+ { " and " * editor #2 "{vv~}{ll}" format.name$ * }
+ if$
+ }
+ if$
+ }
+ if$
+}
+
+FUNCTION {format.book.crossref}
+{ volume empty$
+ { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
+ "In "
+ }
+ { "Volume" volume tie.or.space.connect
+ " of " *
+ }
+ if$
+ editor empty$
+ editor field.or.null author field.or.null =
+ or
+ { key empty$
+ { series empty$
+ { "need editor, key, or series for " cite$ * " to crossref " *
+ crossref * warning$
+ "" *
+ }
+ { "{\em " * series * "\/}" * }
+ if$
+ }
+ { key * }
+ if$
+ }
+ { format.crossref.editor * }
+ if$
+ " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.incoll.inproc.crossref}
+{ editor empty$
+ editor field.or.null author field.or.null =
+ or
+ { key empty$
+ { booktitle empty$
+ { "need editor, key, or booktitle for " cite$ * " to crossref " *
+ crossref * warning$
+ ""
+ }
+ { "In {\em " booktitle * "\/}" * }
+ if$
+ }
+ { "In " key * }
+ if$
+ }
+ { "In " format.crossref.editor * }
+ if$
+ " \cite{" * crossref * "}" *
+}
+
+FUNCTION {article}
+{ output.bibitem
+ format.authors "author" output.check
+ format.title "title" output.check
+ new.block
+ crossref missing$
+ { journal field.or.null
+ format.vol.num.pages
+ format.date empty$
+ 'skip$
+ { duplicate$ empty$
+ { pop$ format.date paren }
+ { " " * format.date paren * }
+ if$
+ }
+ if$
+ output
+ }
+ { format.article.crossref output.nonnull
+ format.pages output
+ }
+ if$
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {book}
+{ output.bibitem
+ author empty$
+ { format.editors "author and editor" output.check }
+ { format.authors output.nonnull
+ crossref missing$
+ { "author and editor" editor either.or.check }
+ 'skip$
+ if$
+ }
+ if$
+ new.block
+ format.btitle "title" output.check
+ crossref missing$
+ { format.bvolume output
+ new.block
+ format.number.series output
+ new.sentence
+ publisher "publisher" output.check
+ address output
+ }
+ { new.block
+ format.book.crossref output.nonnull
+ }
+ if$
+ format.edition output
+ format.date "year" output.check
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {booklet}
+{ output.bibitem
+ format.authors output
+ new.block
+ format.title "title" output.check
+ howpublished address new.block.checkb
+ howpublished output
+ address output
+ format.date output
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {inbook}
+{ output.bibitem
+ author empty$
+ { format.editors "author and editor" output.check }
+ { format.authors output.nonnull
+ crossref missing$
+ { "author and editor" editor either.or.check }
+ 'skip$
+ if$
+ }
+ if$
+ new.block
+ format.btitle "title" output.check
+ crossref missing$
+ { format.bvolume output
+ format.chapter.pages "chapter and pages" output.check
+ new.block
+ format.number.series output
+ new.sentence
+ publisher "publisher" output.check
+ address output
+ }
+ { format.chapter.pages "chapter and pages" output.check
+ new.block
+ format.book.crossref output.nonnull
+ }
+ if$
+ format.edition output
+ format.date "year" output.check
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {incollection}
+{ output.bibitem
+ format.authors "author" output.check
+ new.block
+ format.title "title" output.check
+ new.block
+ crossref missing$
+ { format.in.ed.booktitle "booktitle" output.check
+ format.bvolume output
+ format.number.series output
+ format.chapter.pages output
+ new.sentence
+ publisher "publisher" output.check
+ address output
+ format.edition output
+ format.date "year" output.check
+ }
+ { format.incoll.inproc.crossref output.nonnull
+ format.chapter.pages output
+ }
+ if$
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {inproceedings}
+{ output.bibitem
+ format.authors "author" output.check
+ new.block
+ format.title "title" output.check
+ new.block
+ crossref missing$
+ { format.in.ed.booktitle "booktitle" output.check
+ format.bvolume output
+ format.number.series output
+ format.pages output
+ address empty$
+ { organization publisher new.sentence.checkb
+ organization output
+ publisher output
+ format.date "year" output.check
+ }
+ { address output.nonnull
+ format.date "year" output.check
+ new.sentence
+ organization output
+ publisher output
+ }
+ if$
+ }
+ { format.incoll.inproc.crossref output.nonnull
+ format.pages output
+ }
+ if$
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {conference} { inproceedings }
+
+FUNCTION {manual}
+{ output.bibitem
+ author empty$
+ { organization empty$
+ 'skip$
+ { organization output.nonnull
+ address output
+ }
+ if$
+ }
+ { format.authors output.nonnull }
+ if$
+ new.block
+ format.btitle "title" output.check
+ author empty$
+ { organization empty$
+ { address new.block.checka
+ address output
+ }
+ 'skip$
+ if$
+ }
+ { organization address new.block.checkb
+ organization output
+ address output
+ }
+ if$
+ format.edition output
+ format.date output
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {mastersthesis}
+{ output.bibitem
+ format.authors "author" output.check
+ new.block
+ format.title "title" output.check
+ new.block
+ "Master's thesis" format.thesis.type output.nonnull
+ school "school" output.check
+ address output
+ format.date "year" output.check
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {misc}
+{ output.bibitem
+ format.authors output
+ title howpublished new.block.checkb
+ format.title output
+ howpublished new.block.checka
+ howpublished output
+ format.date output
+ new.block
+ note output
+ fin.entry
+ empty.misc.check
+}
+
+FUNCTION {phdthesis}
+{ output.bibitem
+ format.authors "author" output.check
+ new.block
+ format.btitle "title" output.check
+ new.block
+ "PhD thesis" format.thesis.type output.nonnull
+ school "school" output.check
+ address output
+ format.date "year" output.check
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {proceedings}
+{ output.bibitem
+ editor empty$
+ { organization output }
+ { format.editors output.nonnull }
+ if$
+ new.block
+ format.btitle "title" output.check
+ format.bvolume output
+ format.number.series output
+ address empty$
+ { editor empty$
+ { publisher new.sentence.checka }
+ { organization publisher new.sentence.checkb
+ organization output
+ }
+ if$
+ publisher output
+ format.date "year" output.check
+ }
+ { address output.nonnull
+ format.date "year" output.check
+ new.sentence
+ editor empty$
+ 'skip$
+ { organization output }
+ if$
+ publisher output
+ }
+ if$
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {techreport}
+{ output.bibitem
+ format.authors "author" output.check
+ new.block
+ format.title "title" output.check
+ new.block
+ format.tr.number output.nonnull
+ institution "institution" output.check
+ address output
+ format.date "year" output.check
+ new.block
+ note output
+ fin.entry
+}
+
+FUNCTION {unpublished}
+{ output.bibitem
+ format.authors "author" output.check
+ new.block
+ format.title "title" output.check
+ new.block
+ note "note" output.check
+ format.date output
+ fin.entry
+}
+
+FUNCTION {default.type} { misc }
+
+MACRO {jan} {"Jan."}
+
+MACRO {feb} {"Feb."}
+
+MACRO {mar} {"Mar."}
+
+MACRO {apr} {"Apr."}
+
+MACRO {may} {"May"}
+
+MACRO {jun} {"June"}
+
+MACRO {jul} {"July"}
+
+MACRO {aug} {"Aug."}
+
+MACRO {sep} {"Sept."}
+
+MACRO {oct} {"Oct."}
+
+MACRO {nov} {"Nov."}
+
+MACRO {dec} {"Dec."}
+
+READ
+
+STRINGS { longest.label }
+
+INTEGERS { number.label longest.label.width }
+
+FUNCTION {initialize.longest.label}
+{ "" 'longest.label :=
+ #1 'number.label :=
+ #0 'longest.label.width :=
+}
+
+FUNCTION {longest.label.pass}
+{ number.label int.to.str$ 'label :=
+ number.label #1 + 'number.label :=
+ label width$ longest.label.width >
+ { label 'longest.label :=
+ label width$ 'longest.label.width :=
+ }
+ 'skip$
+ if$
+}
+
+EXECUTE {initialize.longest.label}
+
+ITERATE {longest.label.pass}
+
+FUNCTION {begin.bib}
+{ preamble$ empty$
+ 'skip$
+ { preamble$ write$ newline$ }
+ if$
+ "\begin{thebibliography}{" longest.label * "}" * write$ newline$
+}
+
+EXECUTE {begin.bib}
+
+EXECUTE {init.state.consts}
+
+ITERATE {call.type$}
+
+FUNCTION {end.bib}
+{ newline$
+ "\end{thebibliography}" write$ newline$
+}
+
+EXECUTE {end.bib}
diff --git a/macros/latex/contrib/lion-msc/lion-msc.cls b/macros/latex/contrib/lion-msc/lion-msc.cls
new file mode 100644
index 0000000000..5b9649cb8d
--- /dev/null
+++ b/macros/latex/contrib/lion-msc/lion-msc.cls
@@ -0,0 +1,404 @@
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %
+% lion-msc.cls %
+% %
+% A LaTeX document class for preparing a bachelor/master thesis according to %
+% the specifications of the Leiden Institute of Physics (LION), %
+% Leiden University, The Netherlands %
+% %
+% Original version written by: Michiel de Dood %
+% Leiden Institute of Physics %
+% Leiden University %
+% Niels Bohrweg 2 %
+% 2333 CA, Leiden, The Netherlands %
+% %
+% Please report errors to: Michiel de Dood %
+% e-mail: dood@physics.leidenuniv.nl %
+% telephone: +31-(0)71.527.5929 %
+% %
+% Permission to copy all or part of this work is granted, provided %
+% that the copies are not made or distributed for resale. %
+%
+% This file may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in:
+%
+% http://www.latex-project.org/lppl.txt
+%
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2003/06/01 or later.
+%
+% This work has the LPPL maintenance status "author-maintained".
+% %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+% Considerations:
+% 1. use the ifpdf package to make class a bit more robust?
+% 2. add metadata to pdf?
+% see http://www.howtotex.com/tips-tricks/adding-pdf-metadata-in-latex/
+% \usepackage{ifpdf}
+% \ifpdf
+% \pdfinfo{
+% /Author (Author Name)
+% /Title (Adding PDF metadata in LaTeX)
+% /Keywords (PDF;LaTeX;howtoTeX.com) }
+% \fi
+% 4. potential problem with double line spacing option on title pages.
+
+\typeout{}
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesClass{lion-msc}[2019/05/15 v0.28]
+\typeout{}
+\typeout{Leiden Institute of Physics thesis class - version 0.28}
+\typeout{}
+\typeout{Copyright (c) 2014 Michiel de Dood}
+\typeout{Please send questions, comments, additions, complaints to:}
+\typeout{dood@physics.leidenuniv.nl}
+\typeout{}
+
+% The following are default options that are passed on to the documentclass
+
+% == start : draft and final options
+% Option [double] (default) - sets a double line spacing for easy commenting
+% Option [single] - single line spacing for final report
+
+\def\mystretch{1.5} % This is the default option, sets double line spacing
+ % if nothing is specified \mystretch is still defined
+\DeclareOption{double}{} % When [double] is specified do nothing
+\DeclareOption{single}{ % This option creates the final version
+ \typeout{single linespacing}
+ \def\mystretch{1}}
+
+% Note that the linespacing is set after the \Loadclass command!
+% == ** continued after \Loadclass
+
+% A Master or Bachelor thesis is very similar to a report. The report class
+% is a basic class that should be compatible with many options
+
+\typeout{loading report class}
+
+% Suspicious code. I cannot overule any of these values that are intended to
+% be the default option. In particular the 12pt option...
+
+\PassOptionsToClass{a4paper}{report}
+\PassOptionsToClass{fleqn}{report}
+\PassOptionsToClass{openright}{report}
+
+% 14-03-2017 Michiel de Dood
+% PassOptionsToClass or ExecuteOptions forces the 12 pt font size onto the
+% user. This is unintended behavior, but the report class uses 10 pt font
+% as a default, which is fairly small font
+% http://tex.stackexchange.com/questions/40893/how-to-set-default-font-size-in-latex-cls-file
+
+\def\@@ptsize{12pt}
+\DeclareOption{10pt}{\def\@@ptsize{10pt}}
+\DeclareOption{11pt}{\def\@@ptsize{11pt}}
+\DeclareOption{12pt}{\def\@@ptsize{12pt}}
+
+\DeclareOption*{\PassOptionsToClass{\CurrentOption}{report}}
+\ProcessOptions\relax
+\LoadClass[\@@ptsize]{report}
+
+% == continue : draft and final options
+\def\baselinestretch{\mystretch} % This sets the line spacing
+% == end : double and single options
+
+% A number of packages are provided with the class to minimize potential
+% issues with the use of commands. This is equivalent to \usepackage in the
+% tex file.
+
+% Use the natbib package to take care of citations. Place citations between
+% square brackets, comma separated, and sort and combine multiple references.
+% This should resemble a citation used by the APS.
+
+% 10-01-2014 adding the numbers option to natbib seems to avoid the following:
+% 'natbib error bibliography not compatible with author-year citations'
+% thanks to http://tex.stackexchange.com/questions/54480
+\RequirePackage[square,comma,sort&compress,numbers]{natbib}
+
+% 10-04-2014 added input encoding. Thanks to Merlijn van Deen
+% This allows to use non-ascii input character, e.g. � instead of \"o
+% 14-03-2017 added latin9 as option to ensure compatibility with LyX for unknown
+% reasons. Thanks to Vasco Tenner
+\RequirePackage[utf8,latin9]{inputenc}
+
+% Font selection
+% \RequirePackage{mathptmx}
+\RequirePackage{mathpazo} % Just to make it look less like a Word document
+
+% Special AMS symbols for displaying math
+\RequirePackage{amsmath}
+\RequirePackage{amssymb}
+
+% insertion of graphics
+\RequirePackage[pdftex]{graphicx}
+
+% styling of captions using the captions package
+% 28/03/2014 removed the small (0.5cm) margin for the figure captions
+% 22/05/2014 added hypcap option as suggested by Casper Remeijer
+% 08/07/2013 corrected sl,small override - Tobias de Jong and David Kok
+\RequirePackage[margin=0cm,font={small,sl},labelfont={bf,sl},tableposition=top,singlelinecheck=false,hypcap]{caption}
+
+% Use US english (default) hyphenation rules and provide dutch as an option
+% 14/05/2019 The USenglish as an option started generating errors.
+% changed the option to english instead hoping for more
+% stable behavior (M.J.A. de Dood)
+\RequirePackage[dutch,english]{babel}
+
+% For standard formatting of dates I use the datetime package
+% It is important to load this package AFTER the babel package
+\RequirePackage[us,nodayofweek]{datetime}
+
+% The calc package allows to specify lengths etc. as an arithmetic expression
+\RequirePackage{calc}
+
+% Colored text
+\RequirePackage{xcolor}
+ % used to be color package, but this gives conflicts with user packages
+ % reported by Casper Remeijer June 9, 2016
+
+\definecolor{mygrey}{gray}{0.5}
+\definecolor{lionblue}{RGB}{0,43,127} % The official color, thanks to Ferry Besamusca
+
+% Consistent section styling
+% \RequirePackage{sectsty}
+% \allsectionsfont{\sffamily} % changed 26/03/2014 avoid mixing of fonts
+
+% Chapter styling
+\RequirePackage[Lenny]{fncychap} % consider titlesec as alternative
+\ChRuleWidth{1pt}
+
+% Enable fancy headers
+\RequirePackage{fancyhdr}
+
+% Formatting tools for the title
+\RequirePackage{titling}
+
+% 09/07/2014 Redefine the \cleardoublepage command to get completely empty pages
+\def\cleardoublepage{\clearpage\if@twoside \ifodd\c@page\else
+ \hbox{}
+ \thispagestyle{empty}
+ \newpage
+ \if@twocolumn\hbox{}\newpage\fi\fi\fi}
+
+
+% == start : define several variables to be placed on the titlepage
+\gdef\@studentid{\color{red}use $\backslash$\texttt{studentid\{\ldots\}} to define}
+\gdef\@abstract{\color{red}Please use $\backslash$\texttt{abstract\{\ldots\}} to define an abstract in the document preamble.}
+\gdef\@supervisor{\color{red}use $\backslash$\texttt{supervisor\{\ldots\}} to define}
+\gdef\@corrector{\color{red}use $\backslash$\texttt{corrector\{\ldots\}} to define}
+\gdef\@affiliation{\color{black}Huygens-Kamerlingh Onnes Laboratory, Leiden University}
+\gdef\@address{\color{black}P.O. Box 9500, 2300 RA Leiden, The Netherlands}
+\gdef\@degree{\color{black}Bachelor of Science}
+\gdef\@major{\color{black}Physics}
+
+\def\studentid#1{\gdef\@studentid{#1}}
+\def\abstract#1{\gdef\@abstract{#1}}
+\def\supervisor#1{\gdef\@supervisor{#1}}
+\def\corrector#1{\gdef\@corrector{#1}}
+\gdef\affiliation#1{\gdef\@affiliation{#1}}
+\gdef\address#1{\gdef\@address{#1}}
+\gdef\degree#1{\gdef\@degree{#1}} % 22/05/2014 corrected mix-up of degree and major: Error spotted by Leandros Talman
+\gdef\major#1{\gdef\@major{#1}}
+
+\gdef\theauthor{\@author}
+
+% Optional cover picture
+\def\coverpicture#1{\gdef\@coverpicture{#1}\cover@picturetrue}
+% New if construct: Default condition:
+\newif\ifcover@picture \cover@picturefalse
+
+% Optional dedication added 14-05-2019. Requested by Ruoyan Wang
+% use \dedicate to define
+\def\dedicate#1{\gdef\@dedicate{#1}\dedicationtrue}
+% default option is off
+\newif\ifdedication \dedicationfalse
+
+% == start : title page using titling package
+
+% shift the title up a little compared to the standard definition
+\setlength{\droptitle}{-4cm}
+
+\pretitle{ % this is inserted before the title.
+ \pagestyle{empty}
+ \begin{center}
+ \color{lionblue}
+ \vskip 1em
+ \includegraphics[width=2.5cm]{lion-msc-logo.pdf}
+ \color{lionblue}
+ \noindent\rule{\textwidth}{0.4mm}
+ \vskip 0.5em
+ \huge
+}
+
+\posttitle{
+ \noindent\rule{\textwidth}{0.4mm}
+ \vfill
+ \ifcover@picture
+ \@coverpicture
+ \fi
+ \vfill
+ \vskip 1em
+ \end{center}
+
+ \begin{center}
+ \begin{minipage}[b]{.75\textwidth}
+ \color{black}
+ \begin{center}
+ \normalsize
+ \textsc{Thesis} \\ \vskip 0.5em
+ submitted in partial fulfillment of the \\
+ requirements for the degree of \\ \vskip 0.5em
+ \textsc{\@degree} \\
+ in \\
+ \textsc{\@major} \\ \vskip 0.5em
+ \normalsize
+ Author : \hfill {\@author} \\
+ Student ID : \hfill {\@studentid} \\
+ Supervisor : \hfill {\@supervisor} \\
+ 2$^{nd}$ corrector : \hfill {\@corrector}
+ \par
+ \vskip 1em
+ Leiden, The Netherlands, \@date
+ \end{center}
+ \end{minipage}
+ \end{center}
+ \cleardoublepage
+}
+
+\preauthor{
+ \thispagestyle{empty}
+ \begin{center}
+ \Huge \@title \\
+ \vskip 1 em
+ \color{black}
+ \large \bf
+}
+
+\postauthor{
+ \end{center}
+ \begin{center}
+ \normalsize \@affiliation \\ \@address
+ \lineskip 0.5em
+ \par
+ \end{center}
+}
+
+\predate{
+ \begin{center}
+ \normalsize
+}
+
+% Changed the alignment of the abstract. The centering is plain ugly
+% Following comments of Casper Remeijer
+
+\postdate{
+ \end{center}
+ \begin{center}
+ \vskip 1 em
+ \color{black} \large \textbf{Abstract}
+ \end{center}
+ \vskip 1em
+ \normalsize \@abstract
+ \vfill
+ \ifdedication
+ \clearpage
+ \thispagestyle{empty}
+ \vskip 3em
+ \textit{\@dedicate}
+ \fi
+}
+
+
+% == end : title page using titling package
+
+% == start : pagesize commands
+% note: a4 = 297x210 mm, letter = 280x216 mm
+
+% \setlength{\textwidth}{160mm} % used to be 160
+% \setlength{\textheight}{240mm} % used to be 240
+
+% Now we need to set margins and headers to center the page on the paper.
+% This can be done with a little help of the calc package.
+
+% \setlength{\oddsidemargin}{(\paperwidth-\textwidth)/2-1in}
+% \setlength{\evensidemargin}{(\paperwidth-\textwidth)/2-1in}
+
+% \setlength{\topmargin}{(\paperheight-\textheight-\headheight-\headsep-\footskip)/2-1in}
+% == end : pagesize commands
+
+% == start : Bibliography name changed to References
+
+%% Small caps References as labels for page headers
+%% added \itemsep command to adjust vertical space between references
+%% IMPORTANT NOTE: The references consist of one big list with many \bibitems...
+%% VERY IMPORTANT: \def\bibname should be within the thebibliography environment.
+%% It seems to be defined elsewhere as well (BibTeX?)
+%\newdimen\bibindent
+%\setlength\bibindent{1.5em}
+%\renewenvironment{thebibliography}[1]
+% {\def\bibname{References}
+% \chapter*{\bibname
+% \@mkboth{\textsc\bibname}{\textsc\bibname}}%
+% \list{\@biblabel{\@arabic\c@enumiv}}%
+% {\itemsep 0em
+% \settowidth\labelwidth{\@biblabel{#1}}%
+% \leftmargin\labelwidth
+% \advance\leftmargin\labelsep
+% \@openbib@code
+% \usecounter{enumiv}%
+% \let\p@enumiv\@empty
+% \renewcommand\theenumiv{\@arabic\c@enumiv}}%
+% \sloppy
+% \clubpenalty4000
+% \@clubpenalty \clubpenalty
+% \widowpenalty4000%
+% \sfcode`\.\@m}
+% {\def\@noitemerr
+% {\@latex@warning{Empty `thebibliography' environment}}%
+% \endlist}
+%% == end : Bibliography name changed to References
+
+% == start : appearance of footnotes
+\renewcommand{\thefootnote}{\fnsymbol{footnote}}
+% == end : appearance of footnotes
+
+% == start : remove dots in TOC.
+\renewcommand{\@dotsep}{10000} %% Default value is 4.5
+% == end : remove dots in TOC
+
+% == start : definition of headers
+% 28/03/2014 - removed font change in the headers and footers.
+
+
+\pagestyle{fancy} % 10/04/2014 I moved this up into the creation of the title.
+ % 09/07/2014 and I placed it back because it doesn't work!
+
+\renewcommand{\chaptermark}[1]{\markboth{\small \textit{#1}}{}}
+\renewcommand{\sectionmark}[1]{\markright{\small \textit{\thesection{} #1}}}
+
+%\renewcommand{\sectionmark}[1]{}
+
+\fancyhf{}
+\fancyfoot[CE,CO]{\vskip 5mm \scriptsize{\color{mygrey}Version of \@date -- Created \today~-~\currenttime}}
+\fancyfoot[RO,LE]{\thepage}
+\fancyhead[RO,LE]{\thepage}
+\fancyhead[LO]{\rightmark}
+\fancyhead[RE]{\leftmark}
+\renewcommand{\headrulewidth}{1pt}
+\renewcommand{\footrulewidth}{1pt}
+\addtolength{\headheight}{2.5pt}
+\fancypagestyle{plain}{%
+ \fancyhead{}
+ \renewcommand{\footrulewidth}{0pt}
+ \renewcommand{\headrulewidth}{0pt}
+}
+% == end : definition of headers
+
+% Make references etc. available as hyperlinks.
+% 10-01-2014 [hidelinks] option with thanks to Vasco Tenner
+% 11-10-2014 Move this all the way to the end so that appendices work. Thanks to Thomas Ruytenberg
+% 13-03-2016 Suggestion by Max Snijders to add pdfusetitle to the options of hyperref
+% This adds metadata to the PDF File
+\RequirePackage[pdfusetitle,hidelinks]{hyperref}
diff --git a/macros/latex/contrib/lion-msc/lion-msc.layout b/macros/latex/contrib/lion-msc/lion-msc.layout
new file mode 100644
index 0000000000..8a4a4c4452
--- /dev/null
+++ b/macros/latex/contrib/lion-msc/lion-msc.layout
@@ -0,0 +1,87 @@
+#% Do not delete the line below; configure depends on this
+# \DeclareLaTeXClass[lion-msc]{lion-msc}
+# Article textclass definition file. Taken from initial LyX source code
+# Author : Matthias Ettrich <ettrich@informatik.uni-tuebingen.de>
+# Transposed by Pascal André <andre@via.ecp.fr>
+# Heavily modifed and enhanced by serveral developers.
+
+Format 35
+Input stdclass.inc
+Input stdtitle.inc
+Input numreport.inc
+
+Sides 2
+
+#Insert TOC, roman numbers and clearplage
+TitleLatexName "pagenumbering{roman}\maketitle\tableofcontents\cleardoublepage\pagenumbering{arabic}"
+
+# Default textclass options. The user may need to modify this.
+ClassOptions
+ Other "single"
+End
+
+Style Author
+ Margin Dynamic
+ LatexType Command
+ LatexName author
+ Category FrontMatter
+ InTitle 1
+ ParSkip 0
+ BottomSep 0
+ TopSep 0
+ ParSep 0
+ Align Left
+ Font
+ Size normal
+ EndFont
+ LabelSep xx
+ LabelType Static
+ LabelString "Author"
+ LabelFont
+ Color Green
+ Series Bold
+ EndFont
+
+End
+
+Style Abstract
+ LatexType Command
+ LatexName abstract
+ InTitle 1
+ ItemSep 0.2
+ ParSep 0.3
+End
+
+Style StudentID
+ CopyStyle Author
+ LatexName studentid
+ LabelString "StudentID:"
+End
+
+Style Supervisor
+ CopyStyle Author
+ LatexName supervisor
+ LabelString "Supervisor:"
+End
+
+Style Corrector
+ CopyStyle Author
+ LatexName corrector
+ LabelString "2nd corrector:"
+End
+
+Style Coverpicture
+ CopyStyle Author
+ LatexName coverpicture
+ LabelString "CoverPicture (optional):"
+End
+
+Style OtherFrontmatter
+ CopyStyle Author
+ LatexName ""
+ LabelString "Other frontmatter (optional, explicitely use LateX):"
+End
+
+Preamble
+EndPreamble
+
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+\documentclass[twoside,single]{lion-msc}
+
+\title{The \texttt{lion-msc} document class}
+\author{Michiel de Dood}
+
+%\affiliation{Huygens-Kamerlingh Onnes Laboratory, Leiden University} % this is the default value
+%\affiliation{Instituut-Lorentz, Leiden University} % for theoretical physics
+
+%\affiliation{Huygens-Kamerlingh Onnes Laboratorium, Universiteit Leiden} % experimental physics in Dutch
+%\affiliation{Instituut-Lorentz, Universiteit Leiden} % theoretical physics in Dutch
+
+%\address{P.O. Box 9500, 2300 RA Leiden, The Netherlands} % default address - uncomment if need be
+
+% \newdate{date}{\day}{\month}{\year} % definition of time and date using datetime package
+%\newdate{date}{27}{08}{2010}
+%\date{\displaydate{date}}
+
+%\studentid{19750118} % check you student ID, LaTeX does not do this
+%\abstract{Here goes a wonderful abstract.} % limit your self to 1/2 page or 500 words
+%\supervisor{Jan Aarts} % Note that this should be a LION staff member!
+%\corrector{to be defined} % This could be a LION staff member or your external supervisor
+
+%\degree{Master of Science} % The default option is "Bachelor of Science", change if needed
+
+%\major{Physics and Astronomy} % The default option is "Physics", change if needed
+%\major{Physics and Mathematics}
+
+% optional cover picture - should be jpg or pdf
+% \coverpicture{\includegraphics[width=13cm]{thesisstyle.png}}
+
+% Use this to make hyperlinks visible in the document.
+% \hypersetup{colorlinks=true}
+
+% ---------------------------------------------------------------- My defintions!
+% \renewcommand{\vec}[1] {\ensuremath{ \overrightarrow{ #1 } }}
+\renewcommand{\vec}[1] {\ensuremath{ \mathbf{ #1 } }}
+% \bra \ket \braket and \proj
+\newcommand{\bra}[1]{\ensuremath{\langle #1 \vert}}
+\newcommand{\ket}[1]{\ensuremath{\vert #1 \rangle}}
+\newcommand{\braket}[2]{\ensuremath{\langle #1 \vert #2 \rangle}}
+\newcommand{\proj}[1]{\ensuremath{\vert #1 \rangle \langle #1 \vert}}
+
+\newcommand{\kpar}{\ensuremath{k_\parallel}}
+% ----------------------------------------------------------------
+
+% \usepackage{tocloft}
+% \renewcommand{\cftchapdotsep}{\cftdotsep}
+
+\begin{document}
+
+% roman numbering in the table of contents section
+\pagenumbering{roman}
+
+\maketitle
+
+% Table of contents : it is a good idea to include this into your thesis
+\tableofcontents
+\cleardoublepage
+
+% The following list of figures and list of tables are optional. Remove the comments if needed
+%\listoffigures
+%\newpage
+
+%\listoftables
+%\newpage
+
+% in the main part of the document use standard arabic numbers. Page counter resets to 1.
+\pagenumbering{arabic}
+
+\chapter{Description of the document class \textrm{lion-msc}}
+
+This chapter describes the \textrm{lion-msc} document class. The aim of this document class is to assist staff, students and the university administration with the creation of bachelor and master theses. By using this document class we create a document that has a first page that contains all required information such as title, author, student ID, supervisor, second corrector etc.
+
+Some of the compulsory features are standardized, many other have default values. More experienced \LaTeX users can easily modify the feel and look of the document, but should try not too modify the first pages of the thesis. This is the page that should be handed in to the university administration that keeps this on file together with the grade given by the staff member of the physics department.
+
+At a later stage all bachelor and master theses will be placed in an online repository that is, in principle, publicly available. This repository will look better (more professional) if the first pages and layout of theses is similar.
+
+The use of a specialized document class is a method that is used by many scientific journals to ensure that all submitted articles contain all necessary information. Publishers only accept articles that are typeset according to certain rules. \LaTeX style files and templates are often provided to help authors to comply with the style of the journal.
+
+Currently the document class is still under active development and will be improved. If you use this style to typeset your thesis please do check frequently for updates of the files \textrm{lion-msc.cls} and the associated bibliography style file \textrm{lion-msc.bst}.
+
+\section{Getting Started}
+
+Unzip the zip file into a directory and start with the file minimal.tex. On most systems this should compile if you have the 'lion-msc.cls' file and 'minimal.tex' in the same working directory. 'lion-msc' is based on the report class and any valid option for a report can be passed onto lion-msc. In addition, lion-msc uses several additional packages. Most modern \LaTeX systems have features that allow you to automatically get missing files if your computer is connected to the internet.
+
+A minimal \LaTeX document that should compile with pdf\LaTeX is the following (I called this file 'minimal.tex')
+
+\begin{verbatim}
+\documentclass[twoside,single]{lion-msc}
+
+\title{Title}
+\author{A. Uthor}
+
+\begin{document}
+
+\maketitle
+
+\chapter{Chapter 1}
+
+Here you type the text for the first chapter of
+your thesis.
+
+\end{document}
+\end{verbatim}
+
+If problems arise at this point check if you compile \LaTeX directly to pdf. The older route that converts tex files to dvi files and then to postscript is not supported. It is very unlikely that this will be supported in the future.
+
+If problems persist check if you have all necessary files in the right location, most notably 'lion-msc.cls' and 'logo-leidenuniv.pdf'. If you placed the files in some standard location for your tex installation make sure that your installation knows about these files. A quicker, more fail-safe way around this is to place these files in the same working directory as the \LaTeX file that you are trying to compile.
+
+Once you have made these steps take a look at lion-msc.tex as it contains a more complete template that shows how to use the lion-msc documentclass.
+
+\subsection{Files in this package}
+
+The files included with this package are the following:
+
+\vskip 1em
+
+\begin{tabular}{l l}
+\hline
+\textbf{lion-msc.cls} & documentclass file \\
+\textbf{logo-leidenuniv.pdf} & PDF file with logo of Leiden University. \\
+ & This file is required by the document class \\
+\textbf{lion-msc.bst} & bibliography style file that can be used with bibtex \\
+\textbf{lion-msc.layout} & layout file used for integration with LyX environment \\
+\textbf{minimal.tex} & Minimal \LaTeX file demonstrating the use of \\
+ & lion-msc.cls \\
+\textbf{AlexanderPRA.tex} & \LaTeX file used as an example of a Master Thesis \\
+\textbf{lion-msc.tex} & This file \\
+\textbf{lion-msc.pdf} & PDF file of the compiled version of lion-msc.tex \\
+\textbf{Fig1.png} & Figure used in AlexanderPRA.tex \\
+\textbf{Fig2.png} & Figure used in AlexanderPRA.tex \\
+\textbf{Fig3a.png} & Figure used in AlexanderPRA.tex \\
+\textbf{Fig3b.png} & Figure used in AlexanderPRA.tex \\
+\textbf{Fig4.png} & Figure used in AlexanderPRA.tex \\
+\textbf{4photon.bib} & BibTeX database file for AlexanderPRA.tex \\
+\hline
+\end{tabular}
+
+\section{List of available commands and options}
+
+This section gives an overview of special commands and options that are defined through this documentclass. You can use these to change the appearance of your thesis and to include all necessary information.
+
+\subsection{lion-msc options}
+
+Lion-msc inherits and passes its options to the report class. By default the class uses [a4paper, 12pt, fleqn]. If desired this can be passed on by including valid report class options to the options of lion-msc.
+
+\begin{tabular}{l l}
+\hline
+\textbf{double} & (default) double line spacing, useful for drafts \\
+\textbf{single} & single line spacing. This looks better in the final version \\
+\hline
+\end{tabular}
+
+\subsection{Specific lion-msc commands}
+
+With the lion-msc documentclass most of the required information is entered in the preamble of the \LaTeX document (i.e. before $\backslash$begin\{document\}). This information is made visible by using the $\backslash$maketitle command. This should be the first command after $\backslash$begin\{document\}.
+
+Note that you have to fill out the required options. If you leave these empty, instructions will appear in red on the title page. Most of these commands are quite flexible. For instance you can insert newline characters ($\backslash \backslash$) in the affiliation command. This is practical if you do a project outside LION.
+
+\begin{tabular}{l l}
+\hline
+\textbf{$\backslash$author} & (required) Defines the author \\
+\textbf{$\backslash$title} & (required) Defines the title of your thesis \\
+\textbf{$\backslash$abstract} & (required) Provide your abstract here, \\
+ & making sure that it fits on the page.\\
+\textbf{$\backslash$affiliation} & Sets the affiliation to something else than \\
+ & the default value. \\
+\textbf{$\backslash$address} & Use this to change the default address if needed. \\
+\textbf{$\backslash$studentid} & (required) enter your student ID (studentnummer) \\
+\textbf{$\backslash$supervisor} & (required) provide a valid supervisor. This should \\
+ & be a staff member of the Leiden Physics Department \\
+\textbf{$\backslash$corrector} & (required) provide the name of the 2$^{nd}$ corrector. \\
+ & This could be an external supervisor. \\
+\textbf{$\backslash$degree} & (optional) Default is "Bachelor of Science"\\
+ & Use this to change the default value. \\
+\textbf{$\backslash$major} & (optional) Default is "Physics" \\
+ & Use this to change the default value. \\
+\textbf{$\backslash$coverpicture} & (optional) Insert a cover picture on the first page \\
+ & Usage: \\
+ & $\backslash$coverpicture\{$\backslash$includegraphics[width=13cm]\{picture.jpg\}\} \\
+\textbf{$\backslash$dedicate} & (optional) Use this to dedicate your thesis to someone. \\
+ & Please do respect the university guidelines for this! \\
+
+\hline
+\end{tabular}
+
+Note that these commands are highly flexible and a bit a \LaTeX knowledge will allow you to make all kinds of smart modifications. A common, and reasonable desire is to give credit to the PhD student or postdoc that guided you during the project. You can do this by trying the following code: \\
+$\backslash$supervisor\{PhD student $\backslash \backslash$ $\backslash$hspace*\{$\backslash$fill\}Supervisor\}.\\
+Note that you should always have a staff member from Leiden as your supervisor because this person is authorized to give you the final grade.
+
+\subsection{Packages and additional styling tips}
+
+This documentclass uses a number of standard packages, such as amsmath, amssymb for extra functions and symbols to display math and the graphicx package to display graphics in the document. It uses the natbib package to deal with references to automatically sort and compress multiple references. I do not recommend making changes to this in the document preamble. In particular the interplay between natbib and the bibliography style can give very unexpected results.
+
+The default configuration also uses the hyperref package to create a pdf with hyperlinks. The links are hidden so that the text looks normal; try clicking one of the references or in the table of contents and you will see that you are automatically brought to the appropriate reference or section.
+
+The use of packages inside the documentclass can cause an error when you try to use a package within your \LaTeX document. This typically happens when both the documentclass and your own \LaTeX document use some options. There is a $\backslash$PassOptionsToPackage command that you can use before the $\backslash$documentclass to try to pass the desired option to the package.
+
+\subsubsection{Headers with fancyhdr}
+The headers and footers on each page contain some useful info. This is done using the \verb"fancyhdr" package. You can change the appearance of these by using the $\backslash$fancyhead and $\backslash$fancyfoot commands. See the \verb"fancyhdr" documentation for details. You can also open lion-msc.cls in a text editor and look for these commands. You can place your own commands before the $\backslash$begin\{document\} command in your \LaTeX file. The grey text at the bottom with date and time is there to help you and your supervisor to keep track of the version, so that we do not end up correcting an old version. It may look somewhat strange in the final version and can be removed by using\\
+$\backslash$fancyfoot[CE,CO]\{\}.
+
+\subsubsection{Table of contents styling}
+
+Some people may want to get the original dots back into the table of contents. There is an old-fashioned way of doing this without extra packages. Insert the following in the document preamble. The separation of 4.5 is the default value and can be changed to tune the spacing between dots.
+\begin{verbatim}
+\makeatletter
+\renewcommand\@dotsep{4.5}
+\makeatother
+\end{verbatim}
+An alternative is to use the \verb"tocloft" package that offers additional styling options. Insert the following to use this package. (Suggestion by Casper Remeijer)
+\begin{verbatim}
+\usepackage{tocloft}
+\renewcommand{\cftchapdotsep}{\cftdotsep}
+\end{verbatim}
+
+\subsubsection{Subfigures}
+
+It can be quite useful to have multiple figures next to each other. This can be done with the \verb"subcaption" package. (Suggestion by Casper Remeijer)
+
+\begin{verbatim}
+\usepackage[labelformat=simple,justification=centering]{subcaption}
+\renewcommand\thesubfigure{(\alph{subfigure})}
+\end{verbatim}
+
+\subsubsection{Typesetting of units}
+
+Some people rely on a package called 'siunitx' to deal with the correct typesetting of units in the SI system. The following commands could be added
+to the document preamble. (Suggestion by Casper Remeijer)
+
+\begin{verbatim}
+\usepackage{siunitx}
+\sisetup{separate-uncertainty = true, multi-part-units = single, inter-unit-product = \ensuremath { { } \cdot { } }}
+ % use \pm symbol for uncertainty values, don't repeat the unit, unit multiplication is indicated by means of a half-height dot
+\end{verbatim}
+
+\subsubsection{Indentation of paragraphs}
+
+Some people do not like the standard LaTeX indentation at the beginning of the paragraph. This can be changed using the parskip package
+
+\begin{verbatim}
+\usepackage{parskip}
+\end{verbatim}
+
+\section{Using LyX}
+
+Lyx is a powerfull visual editor that used LateX for typesetting. It exports .tex files that can be submitted to journals. Specifically the visual formula editor is very usefull. It also support track-changes, which is very usefull when collaborating. Some people do not like LyX.
+
+\subsection{Installation}
+
+In order to use the lion-msc style in LyX, the latex style should be installed systemwide. With miktex this is done automatically. Now identify the lion-msc.layout file. It might be located at "c:{\textbackslash}program files{\textbackslash}miktex{\textbackslash}doc{\textbackslash}lion-msc".
+
+The next thing to do is to set the document class to a local layout and choose for the
+\emph{lion-msc.layout} file:
+
+Documents $\rhd$ Settings $\rhd$ Document Class $\rhd$ Local-layout
+
+\include{AlexanderPRA}
+
+%\appendix
+%\include{appa}
+
+\section*{Acknowledgements}
+This research was made possible by financial support from the Dutch Association for Scientific Research (NWO) and the Foundation for Fundamental Research of Matter (FOM).
+
+\bibliographystyle{lion-msc}
+\bibliography{4photon}
+
+\end{document}
+
diff --git a/macros/latex/contrib/lion-msc/minimal.pdf b/macros/latex/contrib/lion-msc/minimal.pdf
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diff --git a/macros/latex/contrib/lion-msc/minimal.tex b/macros/latex/contrib/lion-msc/minimal.tex
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@@ -0,0 +1,14 @@
+\documentclass[twoside,single]{lion-msc}
+
+\title{Title}
+\author{A. Uthor}
+
+\begin{document}
+
+\maketitle
+
+\chapter{Chapter 1}
+
+Here you type the text for the first chapter of your thesis.
+
+\end{document}