S. Barkhofen, T. Weich, A. Potzuweit, H.-J. Stöckmann, U. Kuhl, and M. Zworski, “Experimental Observation of the Spectral Gap in Microwave n-Disk Systems,”10.1103/physrevlett.110.164102__Physical Review Letters, vol. 110, no. 16, Art. no. 164102, 2013, doi:10.1103/physrevlett.110.164102 .

D. Shayovitz, H. Herrmann, W. Sohler, R. Ricken, C. Silberhorn, and D. M. Marom, “Time-to-space conversion of ultrafast waveforms at 155  ;cm in a planar periodically poled lithium niobate waveguide,”10.1364/ol.38.004708__Optics Letters, vol. 38, no. 22, Art. no. 4708, 2013, doi:10.1364/ol.38.004708 .

H. Herrmann, X. Yang, A. Thomas, A. Poppe, W. Sohler, and C. Silberhorn, “Post-selection free, integrated optical source of non-degenerate, polarization entangled photon pairs,”10.1364/oe.21.027981__Optics Express, vol. 21, no. 23, Art. no. 27981, 2013, doi:10.1364/oe.21.027981 .

M. Förtsch et al., “A versatile source of single photons for quantum information processing,”10.1038/ncomms2838__Nature Communications, vol. 4, no. 1, Art. no. 1818, 2013, doi:10.1038/ncomms2838 .

P. P. Rohde, A. Schreiber, M. Stefaák, I. Jex, A. Gilchrist, and C. Silberhorn, “Increasing the Dimensionality of Quantum Walks Using Multiple Walkers,”10.1166/jctn.2013.3104__Journal of Computational and Theoretical Nanoscience, vol. 10, no. 7, pp. 1644–1652, 2013, doi:10.1166/jctn.2013.3104 .

R. Kruse et al., “Spatio-spectral characteristics of parametric down-conversion in waveguide arrays,”10.1088/1367-2630/15/8/083046__New Journal of Physics, vol. 15, no. 8, Art. no. 083046, 2013, doi:10.1088/1367-2630/15/8/083046 .

A. Schreiber et al., “A 2D Quantum Walk Simulation of Two-Particle Dynamics,”10.1126/science.1218448__Science, vol. 336, no. 6077, pp. 55–58, 2012, doi:10.1126/science.1218448 .

A. Christ and C. Silberhorn, “Limits on the deterministic creation of pure single-photon states using parametric down-conversion,”10.1103/physreva.85.023829__Physical Review A, vol. 85, no. 2, Art. no. 023829, 2012, doi:10.1103/physreva.85.023829 .

D. Shayovitz, H. Herrmann, W. Sohler, R. Ricken, C. Silberhorn, and D. M. Marom, “High resolution time-to-space conversion of sub-picosecond pulses at 155µm by non-degenerate SFG in PPLN crystal,”10.1364/oe.20.027388__Optics Express, vol. 20, no. 24, Art. no. 27388, 2012, doi:10.1364/oe.20.027388 .

A. Christ, C. Lupo, and C. Silberhorn, “Exponentially enhanced quantum communication rate by multiplexing continuous-variable teleportation,”10.1088/1367-2630/14/8/083007__New Journal of Physics, vol. 14, no. 8, Art. no. 083007, 2012, doi:10.1088/1367-2630/14/8/083007 .

K. Laiho, M. Avenhaus, and C. Silberhorn, “Characteristics of displaced single photons attained via higher order factorial moments,”10.1088/1367-2630/14/10/105011__New Journal of Physics, vol. 14, no. 10, Art. no. 105011, 2012, doi:10.1088/1367-2630/14/10/105011 .

A. Regensburger et al., “Photon Propagation in a Discrete Fiber Network: An Interplay of Coherence and Losses,”10.1103/physrevlett.107.233902__Physical Review Letters, vol. 107, no. 23, Art. no. 233902, 2011, doi:10.1103/physrevlett.107.233902 .

A. Schreiber, K. N. Cassemiro, V. Potodek, A. Gábris, I. Jex, and C. Silberhorn, “Decoherence and Disorder in Quantum Walks: From Ballistic Spread to Localization,”10.1103/physrevlett.106.180403__Physical Review Letters, vol. 106, no. 18, Art. no. 180403, 2011, doi:10.1103/physrevlett.106.180403 .

K. Laiho, A. Christ, K. N. Cassemiro, and C. Silberhorn, “Testing spectral filters as Gaussian quantum optical channels,”10.1364/ol.36.001476__Optics Letters, vol. 36, no. 8, Art. no. 1476, 2011, doi:10.1364/ol.36.001476 .

C. Söller, O. Cohen, B. J. Smith, I. A. Walmsley, and C. Silberhorn, “High-performance single-photon generation with commercial-grade optical fiber,”10.1103/physreva.83.031806__Physical Review A, vol. 83, no. 3, Art. no. 031806, 2011, doi:10.1103/physreva.83.031806 .

A. Eckstein, A. Christ, P. J. Mosley, and C. Silberhorn, “Realistic g            <sup>(2)</sup>            measurement of a PDC source with single photon detectors in the presence of background,”10.1002/pssc.201000876__physica status solidi c, vol. 8, no. 4, pp. 1216–1219, 2011, doi:10.1002/pssc.201000876 .

A. Eckstein, A. Christ, P. J. Mosley, and C. Silberhorn, “Highly Efficient Single-Pass Source of Pulsed Single-Mode Twin Beams of Light,”10.1103/physrevlett.106.013603__Physical Review Letters, vol. 106, no. 1, Art. no. 013603, 2011, doi:10.1103/physrevlett.106.013603 .

A. Christ, K. Laiho, A. Eckstein, K. N. Cassemiro, and C. Silberhorn, “Probing multimode squeezing with correlation functions,”10.1088/1367-2630/13/3/033027__New Journal of Physics, vol. 13, no. 3, Art. no. 033027, 2011, doi:10.1088/1367-2630/13/3/033027 .

P. P. Rohde, A. Schreiber, M. Stefaák, I. Jex, and C. Silberhorn, “Multi-walker discrete time quantum walks on arbitrary graphs, their properties and their photonic implementation,”10.1088/1367-2630/13/1/013001__New Journal of Physics, vol. 13, no. 1, Art. no. 013001, 2011, doi:10.1088/1367-2630/13/1/013001 .

K. Laiho, K. N. Cassemiro, D. Gross, and C. Silberhorn, “Probing the Negative Wigner Function of a Pulsed Single Photon Point by Point,”10.1103/physrevlett.105.253603__Physical Review Letters, vol. 105, no. 25, Art. no. 253603, 2010, doi:10.1103/physrevlett.105.253603 .

K. N. Cassemiro, K. Laiho, and C. Silberhorn, “Accessing the purity of a single photon by the width of the Hong–Ou–Mandel interference,”10.1088/1367-2630/12/11/113052__New Journal of Physics, vol. 12, no. 11, Art. no. 113052, 2010, doi:10.1088/1367-2630/12/11/113052 .

A. Schreiber et al., “Photons Walking the Line: A Quantum Walk with Adjustable Coin Operations,”10.1103/physrevlett.104.050502__Physical Review Letters, vol. 104, no. 5, Art. no. 050502, 2010, doi:10.1103/physrevlett.104.050502 .

M. Avenhaus, K. Laiho, M. V. Chekhova, and C. Silberhorn, “Accessing Higher Order Correlations in Quantum Optical States by Time Multiplexing,”10.1103/physrevlett.104.063602__Physical Review Letters, vol. 104, no. 6, Art. no. 063602, 2010, doi:10.1103/physrevlett.104.063602 .

A. M. Braczyk, T. C. Ralph, W. Helwig, and C. Silberhorn, “Optimized generation of heralded Fock states using parametric down-conversion,”10.1088/1367-2630/12/6/063001__New Journal of Physics, vol. 12, no. 6, Art. no. 063001, 2010, doi:10.1088/1367-2630/12/6/063001 .

U. L. Andersen, G. Leuchs, and C. Silberhorn, “Continuous-variable quantum information processing,”10.1002/lpor.200910010__Laser &;amp; Photonics Reviews, vol. 4, no. 3, pp. 337–354, 2009, doi:10.1002/lpor.200910010 .

Ch. Silberhorn, N. Korolkova, and G. Leuchs, “Quantum Key Distribution with Bright Entangled Beams,”10.1103/physrevlett.88.167902__Physical Review Letters, vol. 88, no. 16, Art. no. 167902, 2002, doi:10.1103/physrevlett.88.167902 .