A space-suitable, high brilliant entangled photon source for satellite based quantum key distribution

Erik Beckert; Oliver de Vries; Rupert Ursin; Fabian-Oliver Steinlechner; Markus Gräfe; Martha Gilaberte Basset

doi:10.1117/12.2507603

4 March 2019 A space-suitable, high brilliant entangled photon source for satellite based quantum key distribution

Erik Beckert, Oliver de Vries, Rupert Ursin, Fabian-Oliver Steinlechner, Markus Gräfe, Martha Gilaberte Basset

Proceedings Volume 10910, Free-Space Laser Communications XXXI; 1091016 (2019) https://doi.org/10.1117/12.2507603
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

Quantum Key Distribution (QKD) will be the first applications for quantum technologies, addressing information security needs by providing a tool for quantum encryption. An Entangled Photon Source EPS, the key building block for QKD, is presented that is based on a non-linear, Spontaneous Parametric Down Conversion SPDC process in a temperature controlled ppKTP crystal that is double-side pumped at 405 nm in a sagnac interferometer setup. The polarization entangled photons are emitted at 810 nm and at a rate of up to ca. 300k per second at 8 mW pumping power. Visibilities in the HV and the DA polarization base in the range of 97-99% have been measured. The EPS integration was realized in a ruggedized, minimized setup to prove space-suitability during thermal and mechanical environmental testing.

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Citation Download Citation

Erik Beckert, Oliver de Vries, Rupert Ursin, Fabian-Oliver Steinlechner, Markus Gräfe, and Martha Gilaberte Basset "A space-suitable, high brilliant entangled photon source for satellite based quantum key distribution", Proc. SPIE 10910, Free-Space Laser Communications XXXI, 1091016 (4 March 2019); https://doi.org/10.1117/12.2507603

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