Quantum teleportation through atmospheric channels

Year: 2019

Authors: Hofmann K., Semenov AA., Vogel W., Bohmann M.

Autors Affiliation: Univ Rostock, Inst Phys, Arbeitsgrp Theoret Quantenopt, D-18051 Rostock, Germany; NAS Ukraine, Inst Phys, Prospect Nauky 46, UA-03028 Kiev, Ukraine; NAS Ukraine, Bogolyubov Inst Theoret Phys, Vul Metrolohichna 14b, UA-03143 Kiev, Ukraine; INO CNR, Largo Enrico Fermi 2, I-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy.

Abstract: We study the Kimble-Braunstein continuous-variable quantum teleportation with the quantum channel physically realized in the turbulent atmosphere. In this context, we examine the applicability of different strategies preserving the Gaussian entanglement (Bohmann et al 2016 Phys. Rev. A 94 010302(R)) for improving the fidelity of the coherent-state teleportation. First, we demonstrate that increasing the squeezing parameter characterizing the entangled state is restricted by its optimal value, which we derive for realistic experimentally-verified examples. Further, we consider the technique of adaptive correlations of losses and show its performance for channels with large squeezing parameters. Finally, we investigate the efficiencies of postselection strategies in dependence on the stochastic properties of the channel transmittance.

Journal/Review: PHYSICA SCRIPTA

Volume: 94 (12)      Pages from: 125104-1  to: 125104-10

More Information: The authors are grateful to D Vasylyev for enlightening discussions. This work has been supported by Deutsche Forschungsgemeinschaft through Grant No. VO 501/22-2. AAS also acknowledges support from the Department of Physics and Astronomy of the NAS of Ukraine through the project PK 0118U003535. MB acknowledges financial support by the Leopoldina Fellowship Programme of the German National Academy of Science (LPDS 2019-01).
KeyWords: atmospheric quantum optics; quantum teleportation; fluctuating losses; free-space channels
DOI: 10.1088/1402-4896/ab36e0

Citations: 13
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