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Open AccessProceedings

Preserving Nonclassicality in Noisy Communication Channels

by Alessia Allevi 1,*,‡ and Maria Bondani 2,‡
1
Department of Science and High Technology, University of Insubria, Via Valleggio 11, I-22100 Como, Italy
2
Institute for Photonics and Nanotechnologies, CNR, Via Valleggio 11, I-22100 Como, Italy
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Presented at the 11th Italian Quantum Information Science conference (IQIS2018), Catania, Italy, 17–20 September 2018.
Proceedings 2019, 12(1), 3; https://doi.org/10.3390/proceedings2019012003
Published: 25 June 2019
(This article belongs to the Proceedings of 11th Italian Quantum Information Science conference (IQIS2018))
Nowadays, the transmission of quantum information, especially for the distribution of cryptographic keys, is required on a global scale. The main obstacle to overcome in free-space communication is the presence of turbulence, which causes both spatial and temporal deformations of the light signals that code information. Here we investigate the extent at which the transmission of mesoscopic twin-beam states through asymmetric noisy channels degrades the nonclassical nature of the photon-number correlations between signal and idler. We consider three nonclassicality criteria, all written in terms of measurable quantities, and demonstrate, both theoretically and experimentally, that the asymmetry introduced by losses affects the three criteria in different ways.
Keywords: photon statistics; photodetectors; nonlinear parametric processes; Quantum Communication photon statistics; photodetectors; nonlinear parametric processes; Quantum Communication
MDPI and ACS Style

Allevi, A.; Bondani, M. Preserving Nonclassicality in Noisy Communication Channels. Proceedings 2019, 12, 3.

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