Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 33: Quantum Networks: Concepts & Applications

FM 33.2: Talk

Dienstag, 24. September 2019, 14:30–14:45, 1015

Free-space channels: entanglement distribution and teleportation — •Martin Bohmann1,2, Kevin Hofmann1, Andrii A. Semenov1,3, Jan Sperling4, and Werner Vogel11Universität Rostock, Rostock, Germany — 2QSTAR, INO-CNR, and LENS, Firenze, Italy — 3Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine — 4University of Paderborn, Paderborn, Germany

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 continuous-variable entanglement distribution and quantum state teleportation. We perform a rigorous analysis of the quantum states after passing through the turbulent atmosphere and study Gaussian and non-Gaussian entanglement. We identify optimal strategies for the transmission of entangled states, and we show that atmospheric channels differ essentially from constant-loss scenarios. Eventually, we propose strategies for the successful quantum-state teleportation through free-space channels.

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