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

: Beckert, E.; Vries, O. de; Ursin, R.; Steinlechner, F.-O.; Gräfe, M.; Basset, M.G.


Hemmati, H. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Free-Space Laser Communications XXXI : 4-6 February 2019, San Francisco, California, United States
Bellingham, WA: SPIE, 2019 (Proceedings of SPIE 10910)
ISBN: 978-1-5106-2463-4
ISBN: 978-1-5106-2462-7
Paper 1091016, 14 S.
Conference "Free-Space Laser Communications" <31, 2019, San Francisco/Calif.>
Industrial Laser, Laser Source and Laser Applications Conference (LASE) <2019, San Francisco/Calif.>
Photonics West Conference <2019, San Francisco/Calif.>
Fraunhofer IOF ()

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.