Freiburg 2019 – wissenschaftliches Programm
FM 33.3: Talk
Dienstag, 24. September 2019, 14:45–15:00, 1015
Tolerances of Photon Pair Sources for Satellite-Based Quantum Communication — •Rana Sebak1,2 and Fabian Oliver Steinlechner1 — 1Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Albert-Einstein-Straße 7, 07745 Jena — 2Friedrich-Schiller University Jena, Abbe School of Photonics, Albert-Einstein-Str. 5, 07745 Jena, Germany
Satellite-based quantum communication is considered to be one possible way to guarantee unconditional security for communication, by using quantum information protocols enabling quantum key distribution (QKD). High-performance entangled photon-pair sources are the bottleneck for such applications. The efficiency of the photon-pair sources depends critically on their alignment.
The goal of this work is to achieve a robust entangled photon-pair source suitable for harsh environments as present in space. The angular and lateral tolerances of the collection optics were calculated for different pump and collection parameters with various brightness efficiencies. Additionally, they are evaluated experimentally in a type-II phase matched ppKTP crystal pumped at 405 nm. Moreover, different crystal lengths have been investigated while keeping all other parameters constant. We present results on the corresponding spectral power densities.