Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster: Quantum Optics and Photonics III

Q 57.38: Poster

Thursday, March 14, 2019, 16:15–18:15, S Fobau Physik

Towards an integrated PDC source at cryogenic temperatures — •Moritz Bartnick, Frederik Thiele, Jan Philipp Höpker, Raimund Ricken, Viktor Quiring, Harald Herrmann, Christine Silberhorn, and Tim J. Bartley — Universität Paderborn, Warburger Str. 100, 33098 Paderborn, Germany

For applications in quantum communication, integrated photonics provide a powerful technology which is robust, scalable and not sensitive to ambient conditions. Exhibiting a wealth of physical properties, lithium niobate represents a versatile platform in which many highly efficient integrated optical devices could have been realised.

Recently, a fibre-coupled plug-and-play integrated PDC single photon source with a heralding efficiency η > 50% has been demonstrated in lithium niobate [1]. The most promising integrated single photon detectors that have been realised in lithium niobate are superconducting detectors, requiring cryogenic temperatures. Thus, it is now interesting to unify all integrated photonic components at very low temperatures.

The goal of the presented work is to implement a periodically-poled PDC source integrated in lithium niobate at cryogenic temperatures. To adapt the poling period, the refractive index of lithium niobate needs to be characterised at cold temperatures. Since lithium niobate is pyroelectric, it should not be exposed to a fast change in temperature. Further, it is challenging to construct stable fibre-to-waveguide links being efficient both at 775nm and 1550nm wavelength.

[1] Montaut et al. "High-efficiency plug-and-play source of heralded single photons." Physical Review Applied 8.2 (2017): 024021.