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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Optics (Miscellaneous) II
Q 12.3: Talk
Monday, March 14, 2022, 17:00–17:15, Q-H14
Characterization of Cryogenic Integrated Spontaneous Parametric Down-Conversion — •Nina Amelie Lange1, Jan Philipp Höpker1, Raimund Ricken2, Viktor Quiring2, Christof Eigner2, Christine Silberhorn2, and Tim J. Bartley1 — 1Mesoscopic Quantum Optics, Department of Physics, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany — 2Integrated Quantum Optics, Department of Physics, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany
We show for the first time that spontaneous parametric down-conversion (SPDC) in nonlinear waveguides remains functional when operated at cryogenic temperatures. With this proof-of-principle experiment, we demonstrate that SPDC, a standard technology for the generation of nonclassical light under ambient conditions, is fully compatible with integrated components that require cryogenic operating conditions, such as superconducting detectors. We characterize our SPDC source at room temperature and under cryogenic conditions at 4.7 K. We measure the spectral properties, including the marginal spectra of the signal and idler photons and the joint spectral intensity. Our experimental results show very good agreement with theory, based on the temperature-dependent dispersion of the waveguide. Furthermore, we investigate the source performance metrics, which do not show a significant change compared to our results at room temperature. Although we change the operation temperature by nearly two orders of magnitude, our SPDC source remains fully operational.