Freiburg 2019 – wissenschaftliches Programm
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 Vogel1 — 1Universität 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.