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
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 - 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 - 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 - Bartnick, Moritz
AU - Santandrea, Matteo
AU - Höpker, Jan Philipp
AU - Thiele, Frederik
AU - Ricken, Raimund
AU - Quiring, Viktor
AU - Eigner, Christof
AU - Herrmann, Harald
AU - Silberhorn, Christine
AU - Bartley, Tim
ID - 26221
JF - Physical Review Applied
SN - 2331-7019
TI - Cryogenic Second-Harmonic Generation in Periodically Poled Lithium Niobate Waveguides
ER -
TY - CONF
AB - We experimentally investigate the generation of continuous-wave optical squeezing from a titanium-indiffused lithium niobate waveguide resonator at low and high frequencies. The device promises integration with different platform chips for more complex optical systems.
AU - Domeneguetti, Renato R.
AU - Conradi, Hauke
AU - Kleinert, Moritz
AU - Kießler, Christian
AU - Stefszky, Michael
AU - Herrmann, Harald
AU - Silberhorn, Christine
AU - Andersen, Ulrik L.
AU - Neergaard-Nielsen, Jonas Schou
AU - Gehring, Tobias
ID - 39027
KW - Optical systems
KW - Polymer waveguides
KW - Quantum key distribution
KW - Quantum light sources
KW - Squeezed states
KW - Waveguides
T2 - 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
TI - Nonlinear waveguides for integrated quantum light source
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
AB - Nonlinear SU(1,1) interferometers are fruitful and promising tools for spectral engineering and precise measurements with phase sensitivity below the classical bound. Such interferometers have been successfully realized in bulk and fiber-based configurations. However, rapidly developing integrated technologies provide higher efficiencies, smaller footprints, and pave the way to quantum-enhanced on-chip interferometry. In this work, we theoretically realised an integrated architecture of the multimode SU(1,1) interferometer which can be applied to various integrated platforms. The presented interferometer includes a polarization converter between two photon sources and utilizes a continuous-wave (CW) pump. Based on the potassium titanyl phosphate (KTP) platform, we show that this configuration results in almost perfect destructive interference at the output and supersensitivity regions below the classical limit. In addition, we discuss the fundamental difference between single-mode and highly multimode SU(1,1) interferometers in the properties of phase sensitivity and its limits. Finally, we explore how to improve the phase sensitivity by filtering the output radiation and using different seeding states in different modes with various detection strategies.
AU - Ferreri, Alessandro
AU - Santandrea, Matteo
AU - Stefszky, Michael
AU - Luo, Kai Hong
AU - Herrmann, Harald
AU - Silberhorn, Christine
AU - Sharapova, Polina R.
ID - 26077
JF - Quantum
SN - 2521-327X
TI - Spectrally multimode integrated SU(1,1) interferometer
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 - 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
AU - Thiele, Frederik
AU - vom Bruch, Felix
AU - Quiring, Victor
AU - Ricken, Raimund
AU - Herrmann, Harald
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Bartley, Tim
ID - 20157
JF - Optics Express
SN - 1094-4087
TI - Cryogenic electro-optic polarisation conversion in titanium in-diffused lithium niobate waveguides
ER -
TY - JOUR
AU - Vergyris, Panagiotis
AU - Babin, Charles
AU - Nold, Raphael
AU - Gouzien, Elie
AU - Herrmann, Harald
AU - Silberhorn, Christine
AU - Alibart, Olivier
AU - Tanzilli, Sébastien
AU - Kaiser, Florian
ID - 40271
IS - 2
JF - Applied Physics Letters
KW - Physics and Astronomy (miscellaneous)
SN - 0003-6951
TI - Two-photon phase-sensing with single-photon detection
VL - 117
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
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 - 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 - JOUR
AU - Georgi, Philip
AU - Massaro, Marcello
AU - Luo, Kai Hong
AU - Sain, Basudeb
AU - Montaut, Nicola
AU - Herrmann, Harald
AU - Weiss, Thomas
AU - Li, Guixin
AU - Silberhorn, Christine
AU - Zentgraf, Thomas
ID - 12919
JF - Light: Science & Applications
SN - 2047-7538
TI - Metasurface interferometry toward quantum sensors
VL - 8
ER -