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A space-suitable, high brilliant entangled photon source for satellite based quantum key distribution
Author(s): Erik Beckert; Oliver de Vries; Rupert Ursin; Fabian-Oliver Steinlechner; Markus Gräfe; Martha Gilaberte Basset
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Paper 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.

Paper Details

Date Published: 4 March 2019
PDF: 14 pages
Proc. SPIE 10910, Free-Space Laser Communications XXXI, 1091016 (4 March 2019); doi: 10.1117/12.2507603
Show Author Affiliations
Erik Beckert, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Oliver de Vries, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Rupert Ursin, Institut für Quantenoptik und Quanteninformation (Austria)
Fabian-Oliver Steinlechner, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Austria)
Markus Gräfe, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Martha Gilaberte Basset, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)


Published in SPIE Proceedings Vol. 10910:
Free-Space Laser Communications XXXI
Hamid Hemmati; Don M. Boroson, Editor(s)

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