Enhanced quantum communication via optical refocusing
Name
Lloyd-2011-Enhanced quantum communication via optical refocusing..pdf
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Author(s)
Lupo, Cosmo
Giovannetti, Vittorio
Pirandola, Stefano
Mancini, Stefano
Lloyd, Seth
Date Issued
July 2011
Journal
Physical Review A
Publisher
American Physical Society
Citation
Lupo, Cosmo et al. “Enhanced quantum communication via optical refocusing.” Physical Review A 84 (2011): n. pag. Web. 8 Nov. 2011. © 2011 American Physical Society
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.84.010303
