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Lecture A.A. Semenov and D. Vasylyev - "Nonclassical Light in the Atmosphere: Elliptic-Beam Model and Gaussian Entanglement"

Institut für Physik, Universität Rostock, Germany

Max Planck Institute for the Science of Light

Nonclassical Light in the Atmosphere: Elliptic-Beam Model and Gaussian Entanglement

Time, place:
Wednesday, December 7, 2016, 3 p.m.
Small Seminar room A.2.500, Staudtstr. 2

Atmospheric channels are promising candidates for establishing global quantum communications. Atmospheric turbulence randomly modifies light beams, which results in random fluctuations of the aperture transmittance. We discuss a theoretical model, the elliptic-beam approximation, which describes probability distributions of the trans-mittance [1]. This model includes such effects as beam wandering and elliptic beam deformations. The theoretical results are in good agreement with experiments in weak and weak-to-moderate atmospheric channels [2], including the experimental transmission of quadrature squeezing through the atmosphere [3]. Proper results are also obtained for strong-turbulence conditions. As an application of the theory, we consider the transmission of Gaussian entan-gled states through atmospheric channels [4]. We have proposed a protocol, which enables one to preserve Gaussian entanglement in the turbulent atmosphere.
[1] D. Vasylyev, A.A. Semenov, and W. Vogel Phys. Rev. Lett. 117, 090501 (2016).
[2] V. C. Usenko, B. Heim, C. Peuntinger, C. Wittmann, C. Marquardt, G. Leuchs, and R. Filip, New J. Phys. 14, 093048 (2012).
[3] C. Peuntinger, B. Heim, Ch. M¨uller, Ch. Gabriel, Ch. Marquardt, and G. Leuchs, Phys. Rev. Lett. 113, 060502 (2014).[4] M. Bohmann, A. A. Semenov, J. Sperling, and W. Vogel Phys. Rev. A 94, 010302(R) (2016).