Freiburg 2019 – wissenschaftliches Programm
FM 32.5: Talk
Dienstag, 24. September 2019, 15:15–15:30, 1010
Towards high-dimensional quantum communication in Space — Fabian Steinlechner1,2, Oliver de Vries1, •Daniel Rieländer1,3, Markus Gräfe1, and Erik Beckert1 — 1Fraunhofer IOF, Jena, Germany — 2Friedrich Schiller University Jena, Abbe Center of Photonics, Jena, Germany — 3Current address: University of Freiburg, Freiburg, Germany
Entangled photon pairs are a fundamental resource in quantum information processing and their distribution between distant parties is a key challenge in quantum communications. Optical satellite links allow transmitting entangled photons over longer distances than currently possible on ground and could provide a path towards global-scale quantum communication networks.
A key pre-requisite towards the next generation of challenging experiments and the realization of future quantum communication networks, is the development of space-proof entangled photon sources (EPS) with high pair yield and entanglement quality.
Here, we report on the development of a power-efficient polarizationentangled photon source that can sustain the strong vibrations and thermal fluctuations of space flight and operation in space. We outline the factors that led to the baseline optical design and opto-mechanical implementation and discuss some of the critical EPS performance parameters. We outline avenues towards further improvement of EPS performance and conclude with an overview of our efforts towards exploiting high-dimensional entanglement for free-space quantum communications channels with increased capacity.