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Title: Enhanced quantum communication via optical refocusing

Abstract

We consider the problem of quantum communication mediated by a passive optical refocusing system. The model captures the basic features of all those situations in which a signal is either refocused by a repeater for long-distance communication, or it is focused on a detector prior to the information decoding process. Introducing a general method for linear passive optical systems, we determine the conditions under which optical refocusing implies information transmission gain. Although the finite aperture of the repeater may cause loss of information, we show that the presence of the refocusing system can substantially enhance the rate of reliable communication with respect to the free-space propagation. We explicitly address the transferring of classical messages over the quantum channel, but the results can be easily extended to include the case of transferring quantum messages as well.

Authors:
 [1];  [2];  [3];  [1];  [4];  [5]
  1. School of Science and Technology, University of Camerino, I-62032 Camerino (Italy)
  2. National Enterprise for Nanoscience and Nanotechnology (NEST), Scuola Normale Superiore and Istituto Nanoscienze, Consiglio Nazionale delle Ricerche (CNR), I-56126 Pisa (Italy)
  3. Department of Computer Science, University of York, York YO10 5GH (United Kingdom)
  4. (INFN), Sezione di Perugia, I-06123 Perugia (Italy)
  5. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
22038559
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DATA TRANSMISSION; LIGHT TRANSMISSION; OPTICAL SYSTEMS; OPTICS; QUANTUM INFORMATION; SIGNALS

Citation Formats

Lupo, Cosmo, Giovannetti, Vittorio, Pirandola, Stefano, Mancini, Stefano, Istituto Nazionale di Fisica Nucleare, and Lloyd, Seth. Enhanced quantum communication via optical refocusing. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.010303.
Lupo, Cosmo, Giovannetti, Vittorio, Pirandola, Stefano, Mancini, Stefano, Istituto Nazionale di Fisica Nucleare, & Lloyd, Seth. Enhanced quantum communication via optical refocusing. United States. doi:10.1103/PHYSREVA.84.010303.
Lupo, Cosmo, Giovannetti, Vittorio, Pirandola, Stefano, Mancini, Stefano, Istituto Nazionale di Fisica Nucleare, and Lloyd, Seth. Fri . "Enhanced quantum communication via optical refocusing". United States. doi:10.1103/PHYSREVA.84.010303.
@article{osti_22038559,
title = {Enhanced quantum communication via optical refocusing},
author = {Lupo, Cosmo and Giovannetti, Vittorio and Pirandola, Stefano and Mancini, Stefano and Istituto Nazionale di Fisica Nucleare and Lloyd, Seth},
abstractNote = {We consider the problem of quantum communication mediated by a passive optical refocusing system. The model captures the basic features of all those situations in which a signal is either refocused by a repeater for long-distance communication, or it is focused on a detector prior to the information decoding process. Introducing a general method for linear passive optical systems, we determine the conditions under which optical refocusing implies information transmission gain. Although the finite aperture of the repeater may cause loss of information, we show that the presence of the refocusing system can substantially enhance the rate of reliable communication with respect to the free-space propagation. We explicitly address the transferring of classical messages over the quantum channel, but the results can be easily extended to include the case of transferring quantum messages as well.},
doi = {10.1103/PHYSREVA.84.010303},
journal = {Physical Review. A},
issn = {1050-2947},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}