Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 45: Quantum Information (Quantum Communication) II
Q 45.3: Talk
Thursday, March 14, 2019, 11:00–11:15, S HS 002 Chemie
Atmospheric quantum optics: the role of fluctuating losses — •Martin Bohmann1,2, Jan Sperling3, Andrii A. Semenov1,4, and Werner Vogel1 — 1Theoretische Quantenoptik, Universität Rostock — 2QSTAR, INO-CNR, and LENS, Firenze, Italy — 3Integrated Quantum Optics Group, University of Paderborn — 4Institute of Physics, National Academy of Sciences of Ukraine
Global quantum communication based on atmospheric free-space channels is a rapidly developing and growing research area. In this contribution, we address the question of how fluctuating losses in such channels affect the quantum properties of light. We perform a rigorous analysis of the quantum states after passing through the turbulent atmosphere and study different quantum effects including single-mode nonclassicality and Gaussian, non-Gaussian, and multi-partite entanglement. The survival of nonclassical effects in free-space channels is shown to depend on the mean photon number and on coherent displacements. Therefore, it differs essentially from constant-loss scenarios. We propose optimal strategies for the transmission of nonclassical quantum states. Eventually, our results will help to improve free-space quantum communication.