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Optimizing the propagation of mesoscopic twin-beam states for novel quantum communication protocols

Alessia Allevi

https://orcid.org/0000-0002-1972-3124

Department of Science and High Technology, University of Insubria, Via Valleggio 11, I-22100 Como, Italy

Institute for Photonics and Nanotechnologies, IFN-CNR, Via Valleggio 11, I-22100 Como, Italy

E-mail Address: [email protected]

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Francesca Molteni

Department of Science and High Technology, University of Insubria, Via Valleggio 11, I-22100 Como, Italy

E-mail Address: [email protected]

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Silvia Zambelli

Department of Science and High Technology, University of Insubria, Via Valleggio 11, I-22100 Como, Italy

E-mail Address: [email protected]

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, and

Maria Bondani

Institute for Photonics and Nanotechnologies, IFN-CNR, Via Valleggio 11, I-22100 Como, Italy

E-mail Address: [email protected]

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https://doi.org/10.1142/S021974992340004XCited by:3 (Source: Crossref)

This article is part of the issue:

Special Issue: Quantum Lectures
Guest Editors: Alessio Avella, Fabrizio Piacentini, Marco Gramegna, Ivano Ruo Berchera, Milena D'Angelo, Francesco V. Pepe and Paolo Olivero

Abstract

Nowadays, optical Quantum Communication has reached a mature level, especially in free space and through optical fibers. Experimental implementations usually involve single-photon states or weak coherent states detected by single-photon detectors. In contrast to these standard configurations, in our work we consider mesoscopic twin-beam (TWB) states revealed by photon-number-resolving detectors. By properly acting on the natural divergence of the generated beams, we show that they remain nonclassical even at a moderate distance from the nonlinear crystal in which they are produced. We also consider the case where one of the two parties of TWB is partially transmitted through water, and show that the nonclassicality of the states is preserved. This result suggests that mesoscopic TWB states can be considered for the new and growing scenario of underwater Quantum Communication.

Keywords:

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