TY - JOUR
AB - Ferroelectric domain wall (DW) conductivity (DWC) can be attributed to two separate mechanisms: (a) the injection/ejection of charge carriers across the Schottky barrier formed at the (metal-)electrode-DW junction and (b) the transport of those charge carriers along the DW. Current-voltage (I-U) characteristics, recorded at variable temperatures from LiNbO3 (LNO) DWs, are clearly able to differentiate between these two contributions. Practically, they allow us to directly quantify the physical parameters relevant to the two mechanisms (a) and (b) mentioned above. These are, for example, the resistance of the DW, the saturation current, the ideality factor, and the Schottky barrier height of the electrode-DW junction. Furthermore, the activation energies needed to initiate the thermally activated electronic transport along the DWs can be extracted. In addition, we show that electronic transport along LNO DWs can be elegantly viewed and interpreted in an adapted semiconductor picture based on a double-diode, double-resistor equivalent-circuit model, the R2D2 model. Finally, our R2D2 model was checked for its universality by successfully fitting the I-U curves of not only z-cut LNO bulk DWs, but equally of z-cut thin-film LNO DWs, and of x-cut thin-film DWs as reported in literature.
AU - Zahn, Manuel
AU - Beyreuther, Elke
AU - Kiseleva, Iuliia
AU - Lotfy, Ahmed Samir
AU - McCluskey, Conor J.
AU - Maguire, Jesi R.
AU - Suna, Ahmet
AU - Rüsing, Michael
AU - Gregg, J. Marty
AU - Eng, Lukas M.
ID - 51156
IS - 2
JF - Physical Review Applied
KW - General Physics and Astronomy
SN - 2331-7019
TI - Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium
VL - 21
ER -
TY - JOUR
AU - Babai-Hemati, Jonas
AU - vom Bruch, Felix
AU - Herrmann, Harald
AU - Silberhorn, Christine
ID - 51339
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters
ER -
TY - JOUR
AB - In real photonic quantum systems losses are an unavoidable factor limiting the scalability to many modes and particles, restraining their application in fields as quantum information and communication. For this reason, a considerable amount of engineering effort has been taken in order to improve the quality of particle sources and system components. At the same time, data analysis and collection methods based on post-selection have been used to mitigate the effect of particle losses. This has allowed for investigating experimentally multi-particle evolutions where the observer lacks knowledge about the system's intermediate propagation states. Nonetheless, the fundamental question how losses affect the behaviour of the surviving subset of a multi-particle system has not been investigated so far. For this reason, here we study the impact of particle losses in a quantum walk of two photons reconstructing the output probability distributions for one photon conditioned on the loss of the other in a known mode and temporal step of our evolution network. We present the underlying theoretical scheme that we have devised in order to model controlled particle losses, we describe an experimental platform capable of implementing our theory in a time multiplexing encoding. In the end we show how localized particle losses change the output distributions without altering their asymptotic spreading properties. Finally we devise a quantum civilization problem, a two walker generalisation of single particle recurrence processes.
AU - Pegoraro, Federico
AU - Held, Philip
AU - Barkhofen, Sonja
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 42648
IS - 3
JF - Physica Scripta
SN - 0031-8949
TI - Dynamic conditioning of two particle discrete-time quantum walks
VL - 98
ER -
TY - JOUR
AU - Serino, Laura
AU - Gil López, Jano
AU - Stefszky, Michael
AU - Ricken, Raimund
AU - Eigner, Christof
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 44081
IS - 2
JF - PRX Quantum
KW - General Physics and Astronomy
KW - Mathematical Physics
KW - Applied Mathematics
KW - Electronic
KW - Optical and Magnetic Materials
KW - Electrical and Electronic Engineering
KW - General Computer Science
SN - 2691-3399
TI - Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States
VL - 4
ER -
TY - JOUR
AU - Kruse, Stephan
AU - Serino, Laura
AU - Folge, Patrick Fabian
AU - Echeverria Oviedo, Dana
AU - Bhattacharjee, Abhinandan
AU - Stefszky, Michael
AU - Scheytt, J. Christoph
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 45485
IS - 14
JF - IEEE Photonics Technology Letters
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
KW - Electronic
KW - Optical and Magnetic Materials
SN - 1041-1135
TI - A Pulsed Lidar System With Ultimate Quantum Range Accuracy
VL - 35
ER -
TY - JOUR
AB - Interference between single photons is key for many quantum optics experiments and applications in quantum technologies, such as quantum communication or computation. It is advantageous to operate the systems at telecommunication wavelengths and to integrate the setups for these applications in order to improve stability, compactness and scalability. A new promising material platform for integrated quantum optics is lithium niobate on insulator (LNOI). Here, we realise Hong-Ou-Mandel (HOM) interference between telecom photons from an engineered parametric down-conversion source in an LNOI directional coupler. The coupler has been designed and fabricated in house and provides close to perfect balanced beam splitting. We obtain a raw HOM visibility of (93.5 ± 0.7) %, limited mainly by the source performance and in good agreement with off-chip measurements. This lays the foundation for more sophisticated quantum experiments in LNOI.
AU - Babel, Silia
AU - Bollmers, Laura
AU - Massaro, Marcello
AU - Luo, Kai Hong
AU - Stefszky, Michael
AU - Pegoraro, Federico
AU - Held, Philip
AU - Herrmann, Harald
AU - Eigner, Christof
AU - Brecht, Benjamin
AU - Padberg, Laura
AU - Silberhorn, Christine
ID - 45850
IS - 14
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler
VL - 31
ER -
TY - JOUR
AB - This work reports a fully guided setup for single-mode squeezing on integrated titanium-indiffused periodically poled nonlinear resonators. A continuous-wave laser beam is delivered and the squeezed field is collected by single-mode fibers; up to −3.17(9) dB of useful squeezing is available in fibers. To showcase the usefulness of such a fiber-coupled device, we applied the generated squeezed light in a fiber-based phase sensing experiment, showing a quantum enhancement in the signal-to-noise ratio of 0.35 dB. Moreover, our investigation of the effect of photorefraction on the cavity resonance condition suggests that it causes system instabilities at high powers.
AU - Domeneguetti, Renato
AU - Stefszky, Michael
AU - Herrmann, Harald
AU - Silberhorn, Christine
AU - Andersen, Ulrik L.
AU - Neergaard-Nielsen, Jonas S.
AU - Gehring, Tobias
ID - 46138
IS - 11
JF - Optics Letters
KW - Atomic and Molecular Physics
KW - and Optics
SN - 0146-9592
TI - Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing
VL - 48
ER -
TY - JOUR
AB - We report a titanium indiffused waveguide resonator featuring an integrated electro-optic modulator for cavity length stabilisation that produces close to 5 dB of squeezed light at 1550 nm (2.4 dB directly measured). The resonator is locked on resonance for tens of minutes with 70 mW of SH light incident on the cavity, demonstrating that photorefraction can be mitigated. Squeezed light production concurrent with cavity length stabilisation utilising the integrated EOM is demonstrated. The device demonstrates the suitability of this platform for squeezed light generation in network applications, where stabilisation to the reference field is typically necessary.
AU - Stefszky, M.
AU - vom Bruch, F.
AU - Santandrea, M.
AU - Ricken, R.
AU - Quiring, V.
AU - Eigner, C.
AU - Herrmann, H
AU - Silberhorn, C
ID - 48349
IS - 21
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications
VL - 31
ER -
TY - JOUR
AU - Meyer-Scott, Evan
AU - Prasannan, Nidhin
AU - Dhand, Ish
AU - Eigner, Christof
AU - Quiring, Viktor
AU - Barkhofen, Sonja
AU - Brecht, Benjamin
AU - Plenio, Martin B.
AU - Silberhorn, Christine
ID - 40273
IS - 15
JF - Physical Review Letters
KW - General Physics and Astronomy
SN - 0031-9007
TI - Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing
VL - 129
ER -
TY - CONF
AB - 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.
AU - Meier, Torsten
AU - Hoepker, Jan Philipp
AU - Protte, Maximilian
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Sharapova, Polina R.
AU - Sperling, Jan
AU - Bartley, Tim
ID - 43744
SN - 978-1-957171-05-0
T2 - Conference on Lasers and Electro-Optics: Applications and Technology
TI - Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity
ER -
TY - JOUR
AB - 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.
AU - Padberg, Laura
AU - Quiring, Viktor
AU - Bocchini, Adriana
AU - Santandrea, Matteo
AU - Gerstmann, Uwe
AU - Schmidt, Wolf Gero
AU - Silberhorn, Christine
AU - Eigner, Christof
ID - 33484
JF - Crystals
SN - 2073-4352
TI - DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking
VL - 12
ER -
TY - JOUR
AU - Prasannan, Nidhin
AU - Sperling, Jan
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 34884
IS - 26
JF - Physical Review Letters
KW - General Physics and Astronomy
SN - 0031-9007
TI - Direct Measurement of Higher-Order Nonlinear Polarization Squeezing
VL - 129
ER -
TY - JOUR
AB - 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.
AU - Held, Philip
AU - Engelkemeier, Melanie
AU - De, Syamsundar
AU - Barkhofen, Sonja
AU - Sperling, Jan
AU - Silberhorn, Christine
ID - 30921
IS - 4
JF - Physical Review A
SN - 2469-9926
TI - Driven Gaussian quantum walks
VL - 105
ER -
TY - JOUR
AU - Santandrea, Matteo
AU - Stefszky, Michael
AU - Silberhorn, Christine
ID - 26218
JF - Journal of Optics
SN - 2040-8978
TI - General analytic theory of classical collinear three-wave mixing in a monolithic cavity
ER -
TY - JOUR
AU - De, Syamsundar
AU - Gil López, Jano
AU - Brecht, Benjamin
AU - Silberhorn, Christine
AU - Sánchez-Soto, Luis L.
AU - Hradil, Zdeněk
AU - Řeháček, Jaroslav
ID - 29524
IS - 3
JF - Physical Review Research
KW - General Engineering
SN - 2643-1564
TI - Effects of coherence on temporal resolution
VL - 3
ER -
TY - JOUR
AU - Ansari, Vahid
AU - Brecht, Benjamin
AU - Gil-Lopez, Jano
AU - Donohue, John M.
AU - Řeháček, Jaroslav
AU - Hradil, Zdeněk
AU - Sánchez-Soto, Luis L.
AU - Silberhorn, Christine
ID - 21020
JF - PRX Quantum
SN - 2691-3399
TI - Achieving the Ultimate Quantum Timing Resolution
VL - 2
ER -
TY - JOUR
AU - Roman-Rodriguez, V
AU - Brecht, Benjamin
AU - Srinivasan, K
AU - Silberhorn, Christine
AU - Treps, N
AU - Diamanti, E
AU - Parigi, V
ID - 22259
JF - New Journal of Physics
SN - 1367-2630
TI - Continuous variable multimode quantum states via symmetric group velocity matching
VL - 23
ER -
TY - GEN
AU - Padberg, Laura
AU - Eigner, Christof
AU - Santandrea, Matteo
AU - Silberhorn, Christine
ID - 38135
TI - Production of waveguides made of materials from the KTP family
ER -
TY - CONF
AB - We present a frequency multimode integrated SU (1,1) interferometer with a polarization converter and strong signal-idler photon correlations. Phase sensitivity below the shot noise limit is demonstrated, various filtering and seeding strategies are discussed.
AU - Ferreri, A.
AU - Santandrea, Matteo
AU - Stefszky, Michael
AU - Luo, Kai Hong
AU - Herrmann, Harald
AU - Silberhorn, Christine
AU - Sharapova, Polina
ID - 40374
T2 - Conference on Lasers and Electro-Optics
TI - Multimode integrated SU(1,1) interferometer
ER -
TY - JOUR
AU - Pelucchi, Emanuele
AU - Fagas, Giorgos
AU - Aharonovich, Igor
AU - Englund, Dirk
AU - Figueroa, Eden
AU - Gong, Qihuang
AU - Hannes, Hübel
AU - Liu, Jin
AU - Lu, Chao-Yang
AU - Matsuda, Nobuyuki
AU - Pan, Jian-Wei
AU - Schreck, Florian
AU - Sciarrino, Fabio
AU - Silberhorn, Christine
AU - Wang, Jianwei
AU - Jöns, Klaus
ID - 37936
IS - 3
JF - Nature Reviews Physics
KW - General Physics and Astronomy
SN - 2522-5820
TI - The potential and global outlook of integrated photonics for quantum technologies
VL - 4
ER -
TY - JOUR
AU - Gil López, Jano
AU - Santandrea, Matteo
AU - Roland, Ganaël
AU - Brecht, Benjamin
AU - Eigner, Christof
AU - Ricken, Raimund
AU - Quiring, Viktor
AU - Silberhorn, Christine
ID - 22770
JF - New Journal of Physics
SN - 1367-2630
TI - Improved non-linear devices for quantum applications
ER -
TY - JOUR
AU - Gil López, Jano
AU - Teo, Yong Siah
AU - De, Syamsundar
AU - Brecht, Benjamin
AU - Jeong, Hyunseok
AU - Silberhorn, Christine
AU - Sánchez-Soto, Luis L.
ID - 26410
JF - Optica
SN - 2334-2536
TI - Universal compressive tomography in the time-frequency domain
ER -
TY - JOUR
AU - Luo, Kai Hong
AU - Santandrea, Matteo
AU - Stefszky, Michael
AU - Sperling, Jan
AU - Massaro, Marcello
AU - Ferreri, Alessandro
AU - Sharapova, Polina
AU - Herrmann, Harald
AU - Silberhorn, Christine
ID - 26889
JF - Physical Review A
SN - 2469-9926
TI - Quantum optical coherence: From linear to nonlinear interferometers
ER -
TY - JOUR
AU - Bagrets, Dmitry
AU - Kim, Kun Woo
AU - Barkhofen, Sonja
AU - De, Syamsundar
AU - Sperling, Jan
AU - Silberhorn, Christine
AU - Altland, Alexander
AU - Micklitz, Tobias
ID - 26284
JF - Physical Review Research
SN - 2643-1564
TI - Probing the topological Anderson transition with quantum walks
ER -
TY - JOUR
AU - Geraldi, Andrea
AU - De, Syamsundar
AU - Laneve, Alessandro
AU - Barkhofen, Sonja
AU - Sperling, Jan
AU - Mataloni, Paolo
AU - Silberhorn, Christine
ID - 26287
JF - Physical Review Research
SN - 2643-1564
TI - Transient subdiffusion via disordered quantum walks
ER -
TY - JOUR
AU - Tiedau, J.
AU - Engelkemeier, M.
AU - Brecht, Benjamin
AU - Sperling, Jan
AU - Silberhorn, Christine
ID - 21021
JF - Physical Review Letters
SN - 0031-9007
TI - Statistical Benchmarking of Scalable Photonic Quantum Systems
VL - 126
ER -
TY - JOUR
AU - Prasannan, Nidhin
AU - De, Syamsundar
AU - Barkhofen, Sonja
AU - Brecht, Benjamin
AU - Silberhorn, Christine
AU - Sperling, Jan
ID - 26286
JF - Physical Review A
SN - 2469-9926
TI - Experimental entanglement characterization of two-rebit states
VL - 103
ER -
TY - JOUR
AB - 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.
AU - Brockmeier, Julian
AU - Mackwitz, Peter Walter Martin
AU - Rüsing, Michael
AU - Eigner, Christof
AU - Padberg, Laura
AU - Santandrea, Matteo
AU - Silberhorn, Christine
AU - Zrenner, Artur
AU - Berth, Gerhard
ID - 23826
JF - Crystals
SN - 2073-4352
TI - Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging
ER -
TY - JOUR
AU - Santandrea, Matteo
AU - Stefszky, Michael
AU - Roeland, Ganaël
AU - Silberhorn, Christine
ID - 26223
JF - Optics Express
SN - 1094-4087
TI - Interferometric method for determining the losses of spatially multi-mode nonlinear waveguides based on second harmonic generation
ER -
TY - JOUR
AU - Stefszky, Michael
AU - Santandrea, Matteo
AU - vom Bruch, Felix
AU - Krapick, S.
AU - Eigner, Christof
AU - Ricken, R.
AU - Quiring, V.
AU - Herrmann, Harald
AU - Silberhorn, Christine
ID - 22771
JF - Optics Express
SN - 1094-4087
TI - Waveguide resonator with an integrated phase modulator for second harmonic generation
ER -
TY - JOUR
AB - 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.
AU - Tiedau, Johannes
AU - Schapeler, Timon
AU - Anant, Vikas
AU - Fedder, Helmut
AU - Silberhorn, Christine
AU - Bartley, Tim
ID - 37933
IS - 4
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Single-channel electronic readout of a multipixel superconducting nanowire single photon detector
VL - 28
ER -
TY - JOUR
AB - 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.
AU - Santandrea, Matteo
AU - Stefszky, Michael
AU - Roeland, Ganaël
AU - Silberhorn, Christine
ID - 38051
IS - 4
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Interferometric method for determining the losses of spatially multi-mode nonlinear waveguides based on second harmonic generation.
VL - 28
ER -
TY - JOUR
AU - Mukamel, Shaul
AU - Freyberger, Matthias
AU - Schleich, Wolfgang
AU - Bellini, Marco
AU - Zavatta, Alessandro
AU - Leuchs, Gerd
AU - Silberhorn, Christine
AU - Boyd, Robert W
AU - Sánchez-Soto, Luis Lorenzo
AU - Stefanov, André
AU - Barbieri, Marco
AU - Paterova, Anna
AU - Krivitsky, Leonid
AU - Shwartz, Sharon
AU - Tamasaku, Kenji
AU - Dorfman, Konstantin
AU - Schlawin, Frank
AU - Sandoghdar, Vahid
AU - Raymer, Michael
AU - Marcus, Andrew
AU - Varnavski, Oleg
AU - Goodson, Theodore
AU - Zhou, Zhi-Yuan
AU - Shi, Bao-Sen
AU - Asban, Shahaf
AU - Scully, Marlan
AU - Agarwal, Girish
AU - Peng, Tao
AU - Sokolov, Alexei V
AU - Zhang, Zhe-Dong
AU - Zubairy, M Suhail
AU - Vartanyants, Ivan A
AU - del Valle, Elena
AU - Laussy, Fabrice
ID - 37934
IS - 7
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
KW - Condensed Matter Physics
KW - Atomic and Molecular Physics
KW - and Optics
SN - 0953-4075
TI - Roadmap on quantum light spectroscopy
VL - 53
ER -
TY - JOUR
AU - Meyer-Scott, Evan
AU - Silberhorn, Christine
AU - Migdall, Alan
ID - 37935
IS - 4
JF - Review of Scientific Instruments
KW - Instrumentation
SN - 0034-6748
TI - Single-photon sources: Approaching the ideal through multiplexing
VL - 91
ER -
TY - JOUR
AB - 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.
AU - Dirmeier, Thomas
AU - Tiedau, Johannes
AU - Khan, Imran
AU - Ansari, Vahid
AU - Müller, Christian R.
AU - Silberhorn, Christine
AU - Marquardt, Christoph
AU - Leuchs, Gerd
ID - 37932
IS - 21
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Distillation of squeezing using an engineered pulsed parametric down-conversion source
VL - 28
ER -
TY - JOUR
AU - Eigner, Christof
AU - Padberg, Laura
AU - Santandrea, Matteo
AU - Herrmann, Harald
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 21025
IS - 22
JF - Optics Express
SN - 1094-4087
TI - Spatially single mode photon pair source at 800 nm in periodically poled Rubidium exchanged KTP waveguides
VL - 28
ER -
TY - JOUR
AB - Abstract
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.
AU - Ferreri, A
AU - Ansari, V
AU - Brecht, Benjamin
AU - Silberhorn, Christine
AU - Sharapova, Polina R.
ID - 40381
IS - 4
JF - Quantum Science and Technology
KW - Electrical and Electronic Engineering
KW - Physics and Astronomy (miscellaneous)
KW - Materials Science (miscellaneous)
KW - Atomic and Molecular Physics
KW - and Optics
SN - 2058-9565
TI - Spatial entanglement and state engineering via four-photon Hong–Ou–Mandel interference
VL - 5
ER -
TY - JOUR
AU - Sperling, Jan
AU - Phillips, D. S.
AU - Bulmer, J. F. F
AU - Thekkadath, G. S.
AU - Eckstein, A.
AU - Wolterink, T. A. W.
AU - Lugani, J.
AU - Nam, S. W.
AU - Lita, A.
AU - Gerrits, T.
AU - Vogel, W.
AU - Agarwal, G. S.
AU - Silberhorn, Christine
AU - Walmsley, I. A.
ID - 26294
JF - Physical Review Letters
SN - 0031-9007
TI - Detector-Agnostic Phase-Space Distributions
ER -
TY - JOUR
AU - Engelkemeier, M.
AU - Lorz, L.
AU - De, Syamsundar
AU - Brecht, Benjamin
AU - Dhand, I.
AU - Plenio, M. B.
AU - Silberhorn, Christine
AU - Sperling, Jan
ID - 21023
JF - Physical Review A
SN - 2469-9926
TI - Quantum photonics with active feedback loops
VL - 102
ER -
TY - JOUR
AU - Nitsche, Thomas
AU - De, Syamsundar
AU - Barkhofen, Sonja
AU - Meyer-Scott, Evan
AU - Tiedau, Johannes
AU - Sperling, Jan
AU - Gábris, Aurél
AU - Jex, Igor
AU - Silberhorn, Christine
ID - 26289
JF - Physical Review Letters
SN - 0031-9007
TI - Local Versus Global Two-Photon Interference in Quantum Networks
ER -
TY - JOUR
AB - 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.
AU - Schmidt, Falko
AU - Kozub, Agnieszka L.
AU - Biktagirov, Timur
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Schindlmayr, Arno
AU - Schmidt, Wolf Gero
AU - Gerstmann, Uwe
ID - 19190
IS - 4
JF - Physical Review Research
TI - Free and defect-bound (bi)polarons in LiNbO3: Atomic structure and spectroscopic signatures from ab initio calculations
VL - 2
ER -
TY - JOUR
AU - Bocchini, Adriana
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Schmidt, Wolf Gero
AU - Gerstmann, Uwe
ID - 20682
JF - Phys. Rev. Materials
TI - Understanding gray track formation in KTP: Ti^3+ centers studied from first principles
VL - 4
ER -
TY - JOUR
AU - Padberg, Laura
AU - Santandrea, Matteo
AU - Rüsing, Michael
AU - Brockmeier, Julian
AU - Mackwitz, Peter
AU - Berth, Gerhard
AU - Zrenner, Artur
AU - Eigner, Christof
AU - Silberhorn, Christine
ID - 25920
JF - Optics Express
SN - 1094-4087
TI - Characterisation of width-dependent diffusion dynamics in rubidium-exchanged KTP waveguides
ER -
TY - JOUR
AU - Massaro, Marcello
AU - Meyer-Scott, Evan
AU - Montaut, Nicola
AU - Herrmann, Harald
AU - Silberhorn, Christine
ID - 25038
JF - New Journal of Physics
SN - 1367-2630
TI - Improving SPDC single-photon sources via extended heralding and feed-forward control
ER -
TY - JOUR
AU - Santandrea, Matteo
AU - Stefszky, Michael
AU - Roeland, Ganaël
AU - Silberhorn, Christine
ID - 26224
JF - New Journal of Physics
SN - 1367-2630
TI - Characterisation of fabrication inhomogeneities in Ti:LiNbO3 waveguides
ER -
TY - JOUR
AU - Santandrea, Matteo
AU - Stefszky, Michael
AU - Ansari, Vahid
AU - Silberhorn, Christine
ID - 26226
JF - New Journal of Physics
SN - 1367-2630
TI - Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications
ER -
TY - JOUR
AU - Luo, Kai-Hong
AU - Ansari, Vahid
AU - Massaro, Marcello
AU - Santandrea, Matteo
AU - Eigner, Christof
AU - Ricken, Raimund
AU - Herrmann, Harald
AU - Silberhorn, Christine
ID - 26237
JF - Optics Express
SN - 1094-4087
TI - Counter-propagating photon pair generation in a nonlinear waveguide
ER -
TY - CONF
AU - Meyer-Scott, Evan
AU - Prasannan, Nidhin
AU - Montaut, Nicola
AU - Tiedau, Johannes
AU - Eigner, Christof
AU - Harder, Georg
AU - Sansoni, Linda
AU - Nitsche, Thomas
AU - Herrmann, Harald
AU - Ricken, Raimund
AU - Quiring, Viktor
AU - Bartley, Tim
AU - Barkhofen, Sonja
AU - Silberhorn, Christine
ED - Hasan, Zameer U.
ED - Hemmer, Philip R.
ED - Migdall, Alan L.
ID - 9635
SN - 9781510625082
T2 - Advances in Photonics of Quantum Computing, Memory, and Communication XII
TI - Engineering integrated photon pair sources and multiplexed detectors (Conference Presentation)
ER -
TY - GEN
AU - Padberg, Laura
AU - Eigner, Christof
AU - Santandrea, Matteo
AU - Silberhorn, Christine
ID - 38138
TI - Herstellung von Wellenleitern aus Materialien der KTP-Familie
ER -
TY - JOUR
AU - Xie, Zhenda
AU - Luo, Kai Hong
AU - Chang, Kai Chi
AU - Panoiu, Nicolae C.
AU - Herrmann, Harald
AU - Silberhorn, Christine
AU - Wong, Chee Wei
ID - 38047
IS - 22
JF - Applied Optics
KW - Atomic and Molecular Physics
KW - and Optics
KW - Engineering (miscellaneous)
KW - Electrical and Electronic Engineering
SN - 1559-128X
TI - Efficient C-band single-photon upconversion with chip-scale Ti-indiffused pp-LiNbO3 waveguides
VL - 58
ER -