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 - Abstract
Lithium niobate has emerged as a promising platform for integrated quantum optics, enabling efficient generation, manipulation, and detection of quantum states of light. However, integrating single-photon detectors requires cryogenic operating temperatures, since the best performing detectors are based on narrow superconducting wires. While previous studies have demonstrated the operation of quantum light sources and electro-optic modulators in LiNbO3 at cryogenic temperatures, the thermal transition between room temperature and cryogenic conditions introduces additional effects that can significantly influence device performance. In this paper, we investigate the generation of pyroelectric charges and their impact on the optical properties of lithium niobate waveguides when changing from room temperature to 25 K, and vice versa. We measure the generated pyroelectric charge flow and correlate this with fast changes in the birefringence acquired through the Sénarmont-method. Both electrical and optical influence of the pyroelectric effect occur predominantly at temperatures above 100 K.
AU - Thiele, Frederik
AU - Hummel, Thomas
AU - Lange, Nina Amelie
AU - Dreher, Felix
AU - Protte, Maximilian
AU - Bruch, Felix vom
AU - Lengeling, Sebastian
AU - Herrmann, Harald
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Bartley, Tim
ID - 51356
IS - 1
JF - Materials for Quantum Technology
KW - General Earth and Planetary Sciences
KW - General Environmental Science
SN - 2633-4356
TI - Pyroelectric influence on lithium niobate during the thermal transition for cryogenic integrated photonics
VL - 4
ER -
TY - JOUR
AU - Barkhofen, Sonja
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 38541
IS - 1
JF - Physik in unserer Zeit
TI - Verschränkung wie am Fließband
VL - 54
ER -
TY - JOUR
AU - Lüders, Carolin
AU - Gil-Lopez, Jano
AU - Allgaier, Markus
AU - Brecht, Benjamin
AU - Aßmann, Marc
AU - Silberhorn, Christine
AU - Bayer, Manfred
ID - 42158
IS - 1
JF - Physical Review Applied
KW - General Physics and Astronomy
SN - 2331-7019
TI - Tailored Frequency Conversion Makes Infrared Light Visible for Streak Cameras
VL - 19
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 - CONF
AB - We demonstrate the numerical and experimental realization of optimized optical traveling-wave antennas made of low-loss dielectric materials. These antennas exhibit highly directive radiation patterns and our studies reveal that this nature comes from two dominant guided TE modes excited in the waveguide-like director of the antenna, in addition to the leaky modes. The optimized antennas possess a broadband nature and have a nearunity radiation efficiency at an operational wavelength of 780 nm. Compared to the previously studied plasmonic antennas for photon emission, our all-dielectric approach demonstrates a new class of highly directional, low-loss, and broadband optical antennas.
AU - Farheen, Henna
AU - Yan, Lok-Yee
AU - Leuteritz, Till
AU - Qiao, Siqi
AU - Spreyer, Florian
AU - Schlickriede, Christian
AU - Quiring, Viktor
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Zentgraf, Thomas
AU - Linden, Stefan
AU - Myroshnychenko, Viktor
AU - Förstner, Jens
ED - García-Blanco, Sonia M.
ED - Cheben, Pavel
ID - 43051
KW - tet_topic_opticalantenna
T2 - Integrated Optics: Devices, Materials, and Technologies XXVII
TI - Tailoring the directive nature of optical waveguide antennas
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 - CONF
AB - A frequency-flexible Nyquist pulse synthesizer is presented with optical pulse bandwidths up to fopt=100 GHz and repetition rates equal to fopt/9, fabricated in an electronic-photonic co-integrated platform utilizing linear on-chip drivers.
AU - Kress, Christian
AU - Schwabe, Tobias
AU - Silberhorn, Christine
AU - Scheytt, J. Christoph
ID - 45578
T2 - Conference on Lasers and Electro-Optics (CLEO) 2023
TI - Generation of 100 GHz Periodic Nyquist Pulses using Cascaded Mach-Zehnder Modulators in a Silicon Electronic-Photonic Platform
ER -
TY - JOUR
AB - A reliable, but cost-effective generation of single-photon states is key for practical quantum communication systems. For real-world deployment, waveguide sources offer optimum compatibility with fiber networks and can be embedded in hybrid integrated modules. Here, we present what we believe to be the first chip-size fully integrated fiber-coupled heralded single photon source (HSPS) module based on a hybrid integration of a nonlinear lithium niobate waveguide into a polymer board. Photon pairs at 810 nm (signal) and 1550 nm (idler) are generated via parametric down-conversion pumped at 532 nm in the LiNbO3 waveguide. The pairs are split in the polymer board and routed to separate output ports. The module has a size of (2 × 1) cm^2 and is fully fiber-coupled with one pump input fiber and two output fibers. We measure a heralded second-order correlation function of g_h(2)=0.05 with a heralding efficiency of η_h=3.5% at low pump powers
AU - Kießler, Christian
AU - Conradi, Hauke
AU - Kleinert, Moritz
AU - Quiring, Viktor
AU - Herrmann, Harald
AU - Silberhorn, Christine
ID - 46644
IS - 14
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Fiber-coupled plug-and-play heralded single photon source based on Ti:LiNbO3 and polymer technology
VL - 31
ER -
TY - JOUR
AB - The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising material group for applications in quantum and nonlinear optics. The fabrication of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric domain structures, requires a profound understanding of the material properties and crystal structure. In this regard, Raman spectroscopy offers the possibility to study and visualize domain structures, strain, defects, and the local stoichiometry, which are all factors impacting device performance. However, the accurate interpretation of Raman spectra and their changes with respect to extrinsic and intrinsic defects requires a thorough assignment of the Raman modes to their respective crystal features, which to date is only partly conducted based on phenomenological modelling. To address this issue, we calculated the phonon spectra of potassium titanyl phosphate and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenate (KTiOAsO4) based on density functional theory and compared them with experimental data. Overall, this allows us to assign various spectral features to eigenmodes of lattice substructures with improved detail compared to previous assignments. Nevertheless, the analysis also shows that not all features of the spectra can unambigiously be explained yet. A possible explanation might be that defects or long range fields not included in the modeling play a crucial rule for the resulting Raman spectrum. In conclusion, this work provides an improved foundation into the vibrational properties in the KTiOPO4 material family.
AU - Neufeld, Sergej
AU - Gerstmann, Uwe
AU - Padberg, Laura
AU - Eigner, Christof
AU - Berth, Gerhard
AU - Silberhorn, Christine
AU - Eng, Lukas M.
AU - Schmidt, Wolf Gero
AU - Rüsing, Michael
ID - 47997
IS - 10
JF - Crystals
KW - Inorganic Chemistry
KW - Condensed Matter Physics
KW - General Materials Science
KW - General Chemical Engineering
SN - 2073-4352
TI - Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family
VL - 13
ER -
TY - JOUR
AB - Quantum photonic processing via electro-optic components typically requires electronic links across different operation environments, especially when interfacing cryogenic components such as superconducting single photon detectors with room-temperature control and readout electronics. However, readout and driving electronics can introduce detrimental parasitic effects. Here we show an all-optical control and readout of a superconducting nanowire single photon detector (SNSPD), completely electrically decoupled from room temperature electronics. We provide the operation power for the superconducting detector via a cryogenic photodiode, and readout single photon detection signals via a cryogenic electro-optic modulator in the same cryostat. This method opens the possibility for control and readout of superconducting circuits, and feedforward for photonic quantum computing.
AU - Thiele, Frederik
AU - Hummel, Thomas
AU - McCaughan, Adam N.
AU - Brockmeier, Julian
AU - Protte, Maximilian
AU - Quiring, Victor
AU - Lengeling, Sebastian
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Bartley, Tim
ID - 48399
IS - 20
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - All optical operation of a superconducting photonic interface
VL - 31
ER -
TY - JOUR
AU - Lange, Nina Amelie
AU - Höpker, Jan Philipp
AU - Ricken, Raimund
AU - Quiring, Viktor
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Bartley, Tim
ID - 30342
IS - 1
JF - Optica
KW - Atomic and Molecular Physics
KW - and Optics
KW - Electronic
KW - Optical and Magnetic Materials
SN - 2334-2536
TI - Cryogenic integrated spontaneous parametric down-conversion
VL - 9
ER -
TY - JOUR
AB - 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
.
AU - Thiele, Frederik
AU - vom Bruch, Felix
AU - Brockmeier, Julian
AU - Protte, Maximilian
AU - Hummel, Thomas
AU - Ricken, Raimund
AU - Quiring, Viktor
AU - Lengeling, Sebastian
AU - Herrmann, Harald
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Bartley, Tim
ID - 33672
IS - 3
JF - Journal of Physics: Photonics
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
KW - Electronic
KW - Optical and Magnetic Materials
SN - 2515-7647
TI - Cryogenic electro-optic modulation in titanium in-diffused lithium niobate waveguides
VL - 4
ER -
TY - JOUR
AU - Trenti, Alessandro
AU - Achleitner, Martin
AU - Prawits, Florian
AU - Schrenk, Bernhard
AU - Conradi, Hauke
AU - Kleinert, Moritz
AU - Incoronato, Alfonso
AU - Zanetto, Francesco
AU - Zappa, Franco
AU - Luch, Ilaria Di
AU - Cirkinoglu, Ozan
AU - Leijtens, Xaveer
AU - Bonardi, Antonio
AU - Bruynsteen, Cedric
AU - Yin, Xin
AU - Kießler, Christian
AU - Herrmann, Harald
AU - Silberhorn, Christine
AU - Bozzio, Mathieu
AU - Walther, Philip
AU - Thiel, Hannah C.
AU - Weihs, Gregor
AU - Hubel, Hannes
ID - 38532
IS - 23
JF - Journal of Lightwave Technology
KW - General Engineering
SN - 0733-8724
TI - On-Chip Quantum Communication Devices
VL - 40
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 - 39025
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 - 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 - JOUR
AU - Hamilton, Craig S.
AU - Christ, Regina
AU - Barkhofen, Sonja
AU - Barnett, Stephen M.
AU - Jex, Igor
AU - Silberhorn, Christine
ID - 33450
IS - 4
JF - Physical Review A
SN - 2469-9926
TI - Quantum-state creation in nonlinear-waveguide arrays
VL - 105
ER -