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Q: Fachverband Quantenoptik und Photonik

Q 60: Photonics IV

Q 60.6: Talk

Friday, March 10, 2023, 12:15–12:30, A320

Cryogenic Integrated Nonlinear Optics in Lithium Niobate — •Nina Amelie Lange, Jan Philipp Höpker, Maximilian Protte, Dominik Kostiuk, and Tim J. Bartley — Institute for Photonic Quantum Systems, Paderborn University, Germany

We demonstrate the operation of a nonlinear waveguide at cryogenic temperatures. We investigate the cryogenic performance of Second Harmonic Generation (SHG) and Spontaneous Parametric Down-Conversion (SPDC) in a titanium-indiffused periodically poled lithium niobate waveguide. We show that the nonlinear performance behaves as expected and we can describe the temperature dependent changes very well. Although we change the operation temperature by nearly two orders of magnitude, the SHG process and the SPDC single-photon source remain fully functional.

While SHG and SPDC are typically investigated under ambient conditions, we show that our nonlinear waveguide is compatible with the demanding operation conditions of cryogenic integrated components. The realization of the cryogenic nonlinear processes paves the way for developing novel integrated quantum experiments, for example by combining SPDC sources together with superconducting detectors.