@article{40271,
  author       = {{Vergyris, Panagiotis and Babin, Charles and Nold, Raphael and Gouzien, Elie and Herrmann, Harald and Silberhorn, Christine and Alibart, Olivier and Tanzilli, Sébastien and Kaiser, Florian}},
  issn         = {{0003-6951}},
  journal      = {{Applied Physics Letters}},
  keywords     = {{Physics and Astronomy (miscellaneous)}},
  number       = {{2}},
  publisher    = {{AIP Publishing}},
  title        = {{{Two-photon phase-sensing with single-photon detection}}},
  doi          = {{10.1063/5.0009527}},
  volume       = {{117}},
  year         = {{2020}},
}

@article{37934,
  author       = {{Mukamel, Shaul and Freyberger, Matthias and Schleich, Wolfgang and Bellini, Marco and Zavatta, Alessandro and Leuchs, Gerd and Silberhorn, Christine and Boyd, Robert W and Sánchez-Soto, Luis Lorenzo and Stefanov, André and Barbieri, Marco and Paterova, Anna and Krivitsky, Leonid and Shwartz, Sharon and Tamasaku, Kenji and Dorfman, Konstantin and Schlawin, Frank and Sandoghdar, Vahid and Raymer, Michael and Marcus, Andrew and Varnavski, Oleg and Goodson, Theodore and Zhou, Zhi-Yuan and Shi, Bao-Sen and Asban, Shahaf and Scully, Marlan and Agarwal, Girish and Peng, Tao and Sokolov, Alexei V and Zhang, Zhe-Dong and Zubairy, M Suhail and Vartanyants, Ivan A and del Valle, Elena and Laussy, Fabrice}},
  issn         = {{0953-4075}},
  journal      = {{Journal of Physics B: Atomic, Molecular and Optical Physics}},
  keywords     = {{Condensed Matter Physics, Atomic and Molecular Physics, and Optics}},
  number       = {{7}},
  publisher    = {{IOP Publishing}},
  title        = {{{Roadmap on quantum light spectroscopy}}},
  doi          = {{10.1088/1361-6455/ab69a8}},
  volume       = {{53}},
  year         = {{2020}},
}

@article{37935,
  author       = {{Meyer-Scott, Evan and Silberhorn, Christine and Migdall, Alan}},
  issn         = {{0034-6748}},
  journal      = {{Review of Scientific Instruments}},
  keywords     = {{Instrumentation}},
  number       = {{4}},
  publisher    = {{AIP Publishing}},
  title        = {{{Single-photon sources: Approaching the ideal through           multiplexing}}},
  doi          = {{10.1063/5.0003320}},
  volume       = {{91}},
  year         = {{2020}},
}

@article{37932,
  abstract     = {{<jats:p>Hybrid quantum information processing combines the advantages of discrete and continues variable protocols by realizing protocols consisting of photon counting and homodyne measurements. However, the mode structure of pulsed sources and the properties of the detection schemes often require the use of optical filters in order to combine both detection methods in a common experiment. This limits the efficiency and the overall achievable squeezing of the experiment. In our work, we use photon subtraction to implement the distillation of pulsed squeezed states originating from a genuinely spatially and temporally single-mode parametric down-conversion source in non-linear waveguides. Due to the distillation, we witness an improvement of 0.17 dB from an initial squeezing value of −1.648 ± 0.002 dB, while achieving a purity of 0.58, and confirm the non-Gaussianity of the distilled state via the higher-order cumulants. With this, we demonstrate the source’s suitability for scalable hybrid quantum network applications with pulsed quantum light.</jats:p>}},
  author       = {{Dirmeier, Thomas and Tiedau, Johannes and Khan, Imran and Ansari, Vahid and Müller, Christian R. and Silberhorn, Christine and Marquardt, Christoph and Leuchs, Gerd}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{21}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Distillation of squeezing using an engineered pulsed parametric down-conversion source}}},
  doi          = {{10.1364/oe.402178}},
  volume       = {{28}},
  year         = {{2020}},
}

@article{21025,
  author       = {{Eigner, Christof and Padberg, Laura and Santandrea, Matteo and Herrmann, Harald and Brecht, Benjamin and Silberhorn, Christine}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  number       = {{22}},
  title        = {{{Spatially single mode photon pair source at 800 nm in periodically poled Rubidium exchanged KTP waveguides}}},
  doi          = {{10.1364/oe.399483}},
  volume       = {{28}},
  year         = {{2020}},
}

@article{26294,
  author       = {{Sperling, Jan and Phillips, D. S. and Bulmer, J. F. F and Thekkadath, G. S. and Eckstein, A. and Wolterink, T. A. W. and Lugani, J. and Nam, S. W. and Lita, A. and Gerrits, T. and Vogel, W. and Agarwal, G. S. and Silberhorn, Christine and Walmsley, I. A.}},
  issn         = {{0031-9007}},
  journal      = {{Physical Review Letters}},
  title        = {{{Detector-Agnostic Phase-Space Distributions}}},
  doi          = {{10.1103/physrevlett.124.013605}},
  year         = {{2020}},
}

@article{21023,
  author       = {{Engelkemeier, M. and Lorz, L. and De, Syamsundar and Brecht, Benjamin and Dhand, I. and Plenio, M. B. and Silberhorn, Christine and Sperling, Jan}},
  issn         = {{2469-9926}},
  journal      = {{Physical Review A}},
  title        = {{{Quantum photonics with active feedback loops}}},
  doi          = {{10.1103/physreva.102.023712}},
  volume       = {{102}},
  year         = {{2020}},
}

@article{26289,
  author       = {{Nitsche, Thomas and De, Syamsundar and Barkhofen, Sonja and Meyer-Scott, Evan and Tiedau, Johannes and Sperling, Jan and Gábris, Aurél and Jex, Igor and Silberhorn, Christine}},
  issn         = {{0031-9007}},
  journal      = {{Physical Review Letters}},
  title        = {{{Local Versus Global Two-Photon Interference in Quantum Networks}}},
  doi          = {{10.1103/physrevlett.125.213604}},
  year         = {{2020}},
}

@article{19190,
  abstract     = {{Polarons in dielectric crystals play a crucial role for applications in integrated electronics and optoelectronics. In this work, we use density-functional theory and Green's function methods to explore the microscopic structure and spectroscopic signatures of electron polarons in lithium niobate (LiNbO3). Total-energy calculations and the comparison of calculated electron paramagnetic resonance data with available measurements reveal the formation of bound 
polarons at Nb_Li antisite defects with a quasi-Jahn-Teller distorted, tilted configuration. The defect-formation energies further indicate that (bi)polarons may form not only at 
Nb_Li antisites but also at structures where the antisite Nb atom moves into a neighboring empty oxygen octahedron. Based on these structure models, and on the calculated charge-transition levels and potential-energy barriers, we propose two mechanisms for the optical and thermal splitting of bipolarons, which provide a natural explanation for the reported two-path recombination of bipolarons. Optical-response calculations based on the Bethe-Salpeter equation, in combination with available experimental data and new measurements of the optical absorption spectrum, further corroborate the geometries proposed here for free and defect-bound (bi)polarons.}},
  author       = {{Schmidt, Falko and Kozub, Agnieszka L. and Biktagirov, Timur and Eigner, Christof and Silberhorn, Christine and Schindlmayr, Arno and Schmidt, Wolf Gero and Gerstmann, Uwe}},
  issn         = {{2643-1564}},
  journal      = {{Physical Review Research}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  title        = {{{Free and defect-bound (bi)polarons in LiNbO3: Atomic structure and spectroscopic signatures from ab initio calculations}}},
  doi          = {{10.1103/PhysRevResearch.2.043002}},
  volume       = {{2}},
  year         = {{2020}},
}

@article{20682,
  author       = {{Bocchini, Adriana and Eigner, Christof and Silberhorn, Christine and Schmidt, Wolf Gero and Gerstmann, Uwe}},
  journal      = {{Phys. Rev. Materials}},
  pages        = {{124402}},
  publisher    = {{American Physical Society}},
  title        = {{{Understanding gray track formation in KTP: Ti^3+ centers studied from first principles}}},
  doi          = {{10.1103/PhysRevMaterials.4.124402}},
  volume       = {{4}},
  year         = {{2020}},
}

@article{38051,
  abstract     = {{<jats:p>The characterisation of loss in optical waveguides is essential in understanding the performance of these devices and their limitations. Whilst interferometric-based methods generally provide the best results for low-loss waveguides, they are almost exclusively used to provide characterization in cases where the waveguide is spatially single-mode. Here, we introduce a Fabry-Pérot-based scheme to estimate the losses of a nonlinear (birefringent or quasi-phase matched) waveguide at a wavelength where it is multi-mode. The method involves measuring the generated second harmonic power as the pump wavelength is scanned over the phase matching region. Furthermore, it is shown that this method allows one to infer the losses of different second harmonic spatial modes by scanning the pump field over the separated phase matching spectra. By fitting the measured phase matching spectra from different titanium indiffused lithium niobate waveguides to the model presented in this paper, it is shown that one can estimate the second harmonic losses of a single spatial-mode, at wavelengths where the waveguides are spatially multi-mode.</jats:p>}},
  author       = {{Santandrea, Matteo and Stefszky, Michael and Roeland, Ganaël and Silberhorn, Christine}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{4}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Interferometric method for determining the losses of spatially multi-mode nonlinear waveguides based on second harmonic generation.}}},
  doi          = {{10.1364/oe.380788}},
  volume       = {{28}},
  year         = {{2020}},
}

@article{40381,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>The phenomenon of entanglement is the basis of quantum information and quantum communication processes. Entangled systems with a large number of photons are of great interest at present because they provide a platform for streaming technologies based on photonics. In this paper we present a device which operates with four-photons and based on the Hong–Ou–Mandel interference. The presented device allows to maximize the degree of spatial entanglement and generate the highly entangled four-dimensional Bell states. Furthermore, the use of the interferometer in different regimes leads to fast interference fringes in the coincidence probability with period of oscillations twice smaller than the pump wavelength. We have a good agreement between theoretical simulations and experimental results.</jats:p>}},
  author       = {{Ferreri, A and Ansari, V and Brecht, Benjamin and Silberhorn, Christine and Sharapova, Polina R.}},
  issn         = {{2058-9565}},
  journal      = {{Quantum Science and Technology}},
  keywords     = {{Electrical and Electronic Engineering, Physics and Astronomy (miscellaneous), Materials Science (miscellaneous), Atomic and Molecular Physics, and Optics}},
  number       = {{4}},
  publisher    = {{IOP Publishing}},
  title        = {{{Spatial entanglement and state engineering via four-photon Hong–Ou–Mandel interference}}},
  doi          = {{10.1088/2058-9565/abb411}},
  volume       = {{5}},
  year         = {{2020}},
}

@article{37933,
  abstract     = {{<jats:p>We present a time-over-threshold readout technique to count the number of activated pixels from an array of superconducting nanowire single photon detectors (SNSPDs). This technique places no additional heatload on the cryostat, and retains the intrinsic count rate of the time-tagger. We demonstrate proof-of-principle operation with respect to a four-pixel device. Furthermore, we show that, given some permissible error threshold, the number of pixels that can be reliably read out scales linearly with the intrinsic signal-to-noise ratio of the individual pixel response.</jats:p>}},
  author       = {{Tiedau, Johannes and Schapeler, Timon and Anant, Vikas and Fedder, Helmut and Silberhorn, Christine and Bartley, Tim}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{4}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Single-channel electronic readout of a multipixel superconducting nanowire single photon detector}}},
  doi          = {{10.1364/oe.383111}},
  volume       = {{28}},
  year         = {{2020}},
}

@article{25038,
  author       = {{Massaro, Marcello and Meyer-Scott, Evan and Montaut, Nicola and Herrmann, Harald and Silberhorn, Christine}},
  issn         = {{1367-2630}},
  journal      = {{New Journal of Physics}},
  title        = {{{Improving SPDC single-photon sources via extended heralding and feed-forward control}}},
  doi          = {{10.1088/1367-2630/ab1ec3}},
  year         = {{2019}},
}

@article{26225,
  author       = {{Santandrea, Matteo and Stefszky, Michael and Silberhorn, Christine}},
  issn         = {{0146-9592}},
  journal      = {{Optics Letters}},
  title        = {{{General framework for the analysis of imperfections in nonlinear systems}}},
  doi          = {{10.1364/ol.44.005398}},
  year         = {{2019}},
}

@article{26226,
  author       = {{Santandrea, Matteo and Stefszky, Michael and Ansari, Vahid and Silberhorn, Christine}},
  issn         = {{1367-2630}},
  journal      = {{New Journal of Physics}},
  title        = {{{Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications}}},
  doi          = {{10.1088/1367-2630/aaff13}},
  year         = {{2019}},
}

@article{26237,
  author       = {{Luo, Kai-Hong and Ansari, Vahid and Massaro, Marcello and Santandrea, Matteo and Eigner, Christof and Ricken, Raimund and Herrmann, Harald and Silberhorn, Christine}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  title        = {{{Counter-propagating photon pair generation in a nonlinear waveguide}}},
  doi          = {{10.1364/oe.378789}},
  year         = {{2019}},
}

@article{26500,
  author       = {{Lorz, Lennart and Meyer-Scott, Evan and Nitsche, Thomas and Potoček, Václav and Gábris, Aurél and Barkhofen, Sonja and Jex, Igor and Silberhorn, Christine}},
  issn         = {{2643-1564}},
  journal      = {{Physical Review Research}},
  title        = {{{Photonic quantum walks with four-dimensional coins}}},
  doi          = {{10.1103/physrevresearch.1.033036}},
  year         = {{2019}},
}

@article{26501,
  author       = {{Kruse, Regina and Hamilton, Craig S. and Sansoni, Linda and Barkhofen, Sonja and Silberhorn, Christine and Jex, Igor}},
  issn         = {{2469-9926}},
  journal      = {{Physical Review A}},
  title        = {{{Detailed study of Gaussian boson sampling}}},
  doi          = {{10.1103/physreva.100.032326}},
  year         = {{2019}},
}

@article{26508,
  author       = {{Nitsche, Thomas and Geib, Tobias and Stahl, Christoph and Lorz, Lennart and Cedzich, Christopher and Barkhofen, Sonja and Werner, Reinhard F and Silberhorn, Christine}},
  issn         = {{1367-2630}},
  journal      = {{New Journal of Physics}},
  title        = {{{Eigenvalue measurement of topologically protected edge states in split-step quantum walks}}},
  doi          = {{10.1088/1367-2630/ab12fa}},
  year         = {{2019}},
}