@article{30342,
author = {{Lange, Nina Amelie and Höpker, Jan Philipp and Ricken, Raimund and Quiring, Viktor and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}},
issn = {{2334-2536}},
journal = {{Optica}},
keywords = {{Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
number = {{1}},
publisher = {{The Optical Society}},
title = {{{Cryogenic integrated spontaneous parametric down-conversion}}},
doi = {{10.1364/optica.445576}},
volume = {{9}},
year = {{2022}},
}
@article{33672,
abstract = {{Abstract
Lithium niobate is a promising platform for integrated quantum optics. In this platform, we aim to efficiently manipulate and detect quantum states by combining superconducting single photon detectors and modulators. The cryogenic operation of a superconducting single photon detector dictates the optimisation of the electro-optic modulators under the same operating conditions. To that end, we characterise a phase modulator, directional coupler, and polarisation converter at both ambient and cryogenic temperatures. The operation voltage
V
π
/
2
of these modulators increases, due to the decrease in the electro-optic effect, by 74% for the phase modulator, 84% for the directional coupler and 35% for the polarisation converter below 8.5
K
. The phase modulator preserves its broadband nature and modulates light in the characterised wavelength range. The unbiased bar state of the directional coupler changed by a wavelength shift of 85
n
m
while cooling the device down to 5
K
. The polarisation converter uses periodic poling to phasematch the two orthogonal polarisations. The phasematched wavelength of the utilised poling changes by 112
n
m
when cooling to 5
K
.}},
author = {{Thiele, Frederik and vom Bruch, Felix and Brockmeier, Julian and Protte, Maximilian and Hummel, Thomas and Ricken, Raimund and Quiring, Viktor and Lengeling, Sebastian and Herrmann, Harald and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}},
issn = {{2515-7647}},
journal = {{Journal of Physics: Photonics}},
keywords = {{Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
number = {{3}},
publisher = {{IOP Publishing}},
title = {{{Cryogenic electro-optic modulation in titanium in-diffused lithium niobate waveguides}}},
doi = {{10.1088/2515-7647/ac6c63}},
volume = {{4}},
year = {{2022}},
}
@article{38532,
author = {{Trenti, Alessandro and Achleitner, Martin and Prawits, Florian and Schrenk, Bernhard and Conradi, Hauke and Kleinert, Moritz and Incoronato, Alfonso and Zanetto, Francesco and Zappa, Franco and Luch, Ilaria Di and Cirkinoglu, Ozan and Leijtens, Xaveer and Bonardi, Antonio and Bruynsteen, Cedric and Yin, Xin and Kießler, Christian and Herrmann, Harald and Silberhorn, Christine and Bozzio, Mathieu and Walther, Philip and Thiel, Hannah C. and Weihs, Gregor and Hubel, Hannes}},
issn = {{0733-8724}},
journal = {{Journal of Lightwave Technology}},
keywords = {{General Engineering}},
number = {{23}},
pages = {{7485--7497}},
publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}},
title = {{{On-Chip Quantum Communication Devices}}},
doi = {{10.1109/jlt.2022.3201389}},
volume = {{40}},
year = {{2022}},
}
@article{39025,
author = {{Meyer-Scott, Evan and Prasannan, Nidhin and Dhand, Ish and Eigner, Christof and Quiring, Viktor and Barkhofen, Sonja and Brecht, Benjamin and Plenio, Martin B. and Silberhorn, Christine}},
issn = {{0031-9007}},
journal = {{Physical Review Letters}},
keywords = {{General Physics and Astronomy}},
number = {{15}},
publisher = {{American Physical Society (APS)}},
title = {{{Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing}}},
doi = {{10.1103/physrevlett.129.150501}},
volume = {{129}},
year = {{2022}},
}
@article{40273,
author = {{Meyer-Scott, Evan and Prasannan, Nidhin and Dhand, Ish and Eigner, Christof and Quiring, Viktor and Barkhofen, Sonja and Brecht, Benjamin and Plenio, Martin B. and Silberhorn, Christine}},
issn = {{0031-9007}},
journal = {{Physical Review Letters}},
keywords = {{General Physics and Astronomy}},
number = {{15}},
publisher = {{American Physical Society (APS)}},
title = {{{Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing}}},
doi = {{10.1103/physrevlett.129.150501}},
volume = {{129}},
year = {{2022}},
}
@article{33450,
author = {{Hamilton, Craig S. and Christ, Regina and Barkhofen, Sonja and Barnett, Stephen M. and Jex, Igor and Silberhorn, Christine}},
issn = {{2469-9926}},
journal = {{Physical Review A}},
number = {{4}},
publisher = {{American Physical Society (APS)}},
title = {{{Quantum-state creation in nonlinear-waveguide arrays}}},
doi = {{10.1103/physreva.105.042622}},
volume = {{105}},
year = {{2022}},
}
@inproceedings{41881,
author = {{Pelucchi, E and Fagas, G and Aharonovich, I and Englund, D and Figueroa, E and Gong, Q and Hannes, H and Liu, J and Lu, C-Y and Matsuda, N and Pan, J.W and Schreck, F and Sciarrino, F and Silberhorn, Christine and Wang, J and Jöns, Klaus D.}},
number = {{3}},
pages = {{194--208}},
title = {{{The potential and global outlook of integrated photonics for quantum technologi}}},
volume = {{4}},
year = {{2022}},
}
@inproceedings{43744,
abstract = {{We demonstrate theoretically and experimentally complex correlations in the photon numbers of two-mode quantum states using measurement-induced nonlinearity. For this, we combine the interference of coherent states and single photons with photon sub-traction.}},
author = {{Meier, Torsten and Hoepker, Jan Philipp and Protte, Maximilian and Eigner, Christof and Silberhorn, Christine and Sharapova, Polina R. and Sperling, Jan and Bartley, Tim}},
booktitle = {{Conference on Lasers and Electro-Optics: Applications and Technology}},
isbn = {{978-1-957171-05-0}},
location = {{San Jose, California United States}},
pages = {{JTu3A. 17}},
publisher = {{Optica Publishing Group}},
title = {{{Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity}}},
doi = {{10.1364/CLEO_AT.2022.JTu3A.17}},
year = {{2022}},
}
@article{33484,
abstract = {{We study the DC conductivity in potassium titanyl phosphate (KTiOPO4, KTP) and its isomorphs KTiOAsO4 (KTA) and Rb1%K99%TiOPO4 (RKTP) and introduce a method by which to reduce the overall ionic conductivity in KTP by a potassium nitrate treatment. Furthermore, we create so-called gray tracking in KTP and investigate the ionic conductivity in theses areas. A local unintended reduction of the ionic conductivity is observed in the gray-tracked regions, which also induce additional optical absorption in the material. We show that a thermal treatment in an oxygen-rich atmosphere removes the gray tracking and brings the ionic conductivity as well as the optical transmission back to the original level. These studies can help to choose the best material and treatment for specific applications.}},
author = {{Padberg, Laura and Quiring, Viktor and Bocchini, Adriana and Santandrea, Matteo and Gerstmann, Uwe and Schmidt, Wolf Gero and Silberhorn, Christine and Eigner, Christof}},
issn = {{2073-4352}},
journal = {{Crystals}},
pages = {{1359}},
title = {{{DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking}}},
doi = {{10.3390/cryst12101359}},
volume = {{12}},
year = {{2022}},
}
@article{34884,
author = {{Prasannan, Nidhin and Sperling, Jan and Brecht, Benjamin and Silberhorn, Christine}},
issn = {{0031-9007}},
journal = {{Physical Review Letters}},
keywords = {{General Physics and Astronomy}},
number = {{26}},
publisher = {{American Physical Society (APS)}},
title = {{{Direct Measurement of Higher-Order Nonlinear Polarization Squeezing}}},
doi = {{10.1103/physrevlett.129.263601}},
volume = {{129}},
year = {{2022}},
}
@article{30921,
abstract = {{Quantum walks function as essential means to implement quantum simulators, allowing one to study complex and often directly inaccessible quantum processes in controllable systems. In this contribution, the notion of a driven Gaussian quantum walk is introduced. In contrast to typically considered quantum walks in optical settings, we describe the operation of the walk in terms of a nonlinear map rather than a unitary operation, e.g., by replacing a beam-splitter-type coin with a two-mode squeezer, being a process that is controlled and driven by a pump field. This opens previously unattainable possibilities for quantum walks that include nonlinear elements as core components of their operation, vastly extending their range of applications. A full framework for driven Gaussian quantum walks is developed, including methods to dynamically characterize nonlinear, quantum, and quantum-nonlinear effects. Moreover, driven Gaussian quantum walks are compared with their classically interfering and linear counterparts, which are based on classical coherence of light rather than quantum superpositions. In particular, the generation and boost of highly multimode entanglement, squeezing, and other quantum effects are studied over the duration of the nonlinear walk. Importantly, we prove the quantumness of the evolution itself, regardless of the input state. A scheme for an experimental realization is proposed. Furthermore, nonlinear properties of driven Gaussian quantum walks are explored, such as amplification that leads to an ever increasing number of correlated quantum particles, constituting a source of new walkers during the walk. Therefore, a concept for quantum walks is proposed that leads to—and even produces—directly accessible quantum phenomena, and that renders the quantum simulation of nonlinear processes possible.}},
author = {{Held, Philip and Engelkemeier, Melanie and De, Syamsundar and Barkhofen, Sonja and Sperling, Jan and Silberhorn, Christine}},
issn = {{2469-9926}},
journal = {{Physical Review A}},
number = {{4}},
publisher = {{American Physical Society (APS)}},
title = {{{Driven Gaussian quantum walks}}},
doi = {{10.1103/physreva.105.042210}},
volume = {{105}},
year = {{2022}},
}
@article{29524,
author = {{De, Syamsundar and Gil López, Jano and Brecht, Benjamin and Silberhorn, Christine and Sánchez-Soto, Luis L. and Hradil, Zdeněk and Řeháček, Jaroslav}},
issn = {{2643-1564}},
journal = {{Physical Review Research}},
keywords = {{General Engineering}},
number = {{3}},
publisher = {{American Physical Society (APS)}},
title = {{{Effects of coherence on temporal resolution}}},
doi = {{10.1103/physrevresearch.3.033082}},
volume = {{3}},
year = {{2021}},
}
@article{21020,
author = {{Ansari, Vahid and Brecht, Benjamin and Gil-Lopez, Jano and Donohue, John M. and Řeháček, Jaroslav and Hradil, Zdeněk and Sánchez-Soto, Luis L. and Silberhorn, Christine}},
issn = {{2691-3399}},
journal = {{PRX Quantum}},
title = {{{Achieving the Ultimate Quantum Timing Resolution}}},
doi = {{10.1103/prxquantum.2.010301}},
volume = {{2}},
year = {{2021}},
}
@article{22259,
author = {{Roman-Rodriguez, V and Brecht, Benjamin and Srinivasan, K and Silberhorn, Christine and Treps, N and Diamanti, E and Parigi, V}},
issn = {{1367-2630}},
journal = {{New Journal of Physics}},
title = {{{Continuous variable multimode quantum states via symmetric group velocity matching}}},
doi = {{10.1088/1367-2630/abef96}},
volume = {{23}},
year = {{2021}},
}
@article{23728,
abstract = {{We demonstrate the integration of amorphous tungsten silicide superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides. We show proof-of-principle detection of evanescently coupled photons of 1550 nm wavelength using bidirectional waveguide coupling for two orthogonal polarization directions. We investigate the internal detection efficiency as well as detector absorption using coupling-independent characterization measurements. Furthermore, we describe strategies to improve the yield and efficiency of these devices.}},
author = {{Höpker, Jan Philipp and Verma, Varun B and Protte, Maximilian and Ricken, Raimund and Quiring, Viktor and Eigner, Christof and Ebers, Lena and Hammer, Manfred and Förstner, Jens and Silberhorn, Christine and Mirin, Richard P and Woo Nam, Sae and Bartley, Tim}},
issn = {{2515-7647}},
journal = {{Journal of Physics: Photonics}},
pages = {{034022}},
title = {{{Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides}}},
doi = {{10.1088/2515-7647/ac105b}},
volume = {{3}},
year = {{2021}},
}
@article{26221,
author = {{Bartnick, Moritz and Santandrea, Matteo and Höpker, Jan Philipp and Thiele, Frederik and Ricken, Raimund and Quiring, Viktor and Eigner, Christof and Herrmann, Harald and Silberhorn, Christine and Bartley, Tim}},
issn = {{2331-7019}},
journal = {{Physical Review Applied}},
title = {{{Cryogenic Second-Harmonic Generation in Periodically Poled Lithium Niobate Waveguides}}},
doi = {{10.1103/physrevapplied.15.024028}},
year = {{2021}},
}
@article{23826,
abstract = {{Potassium titanyl phosphate (KTP) is a nonlinear optical material with applications in high-power frequency conversion or quasi-phase matching in submicron period domain grids. A prerequisite for these applications is a precise control and understanding of the poling mechanisms to enable the fabrication of high-grade domain grids. In contrast to the widely used material lithium niobate, the domain growth in KTP is less studied, because many standard methods, such as selective etching or polarization microscopy, provides less insight or are not applicable on non-polar surfaces, respectively. In this work, we present results of confocal Raman-spectroscopy of the ferroelectric domain structure in KTP. This analytical method allows for the visualization of domain grids of the non-polar KTP y-face and therefore more insight into the domain-growth and -structure in KTP, which can be used for improved domain fabrication.}},
author = {{Brockmeier, Julian and Mackwitz, Peter Walter Martin and Rüsing, Michael and Eigner, Christof and Padberg, Laura and Santandrea, Matteo and Silberhorn, Christine and Zrenner, Artur and Berth, Gerhard}},
issn = {{2073-4352}},
journal = {{Crystals}},
title = {{{Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging}}},
doi = {{10.3390/cryst11091086}},
year = {{2021}},
}
@misc{38135,
author = {{Padberg, Laura and Eigner, Christof and Santandrea, Matteo and Silberhorn, Christine}},
title = {{{Production of waveguides made of materials from the KTP family}}},
year = {{2021}},
}
@article{37936,
author = {{Pelucchi, Emanuele and Fagas, Giorgos and Aharonovich, Igor and Englund, Dirk and Figueroa, Eden and Gong, Qihuang and Hannes, Hübel and Liu, Jin and Lu, Chao-Yang and Matsuda, Nobuyuki and Pan, Jian-Wei and Schreck, Florian and Sciarrino, Fabio and Silberhorn, Christine and Wang, Jianwei and Jöns, Klaus}},
issn = {{2522-5820}},
journal = {{Nature Reviews Physics}},
keywords = {{General Physics and Astronomy}},
number = {{3}},
pages = {{194--208}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{The potential and global outlook of integrated photonics for quantum technologies}}},
doi = {{10.1038/s42254-021-00398-z}},
volume = {{4}},
year = {{2021}},
}
@article{22770,
author = {{Gil López, Jano and Santandrea, Matteo and Roland, Ganaël and Brecht, Benjamin and Eigner, Christof and Ricken, Raimund and Quiring, Viktor and Silberhorn, Christine}},
issn = {{1367-2630}},
journal = {{New Journal of Physics}},
title = {{{Improved non-linear devices for quantum applications}}},
doi = {{10.1088/1367-2630/ac09fd}},
year = {{2021}},
}