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Quantum communication with correlated nonclassical states

Pereira, S. F. and Ou, Z. Y. and Kimble, H. J. (2000) Quantum communication with correlated nonclassical states. Physical Review A, 62 (4). Art. No. 042311. ISSN 1050-2947. https://resolver.caltech.edu/CaltechAUTHORS:PERpra00

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Abstract

Nonclassical correlations between the quadrature-phase amplitudes of two spatially separated optical beams are exploited to realize a two-channel quantum communication experiment with a high degree of immunity to interception. For this scheme, either channel alone can have an arbitrarily small signal-to-noise ratio (SNR) for transmission of a coherent "message." However, when the transmitted beams are combined properly upon authorized detection, the encoded message can in principle be recovered with the original SNR of the source. An experimental demonstration has achieved a 3.2 dB improvement in SNR over that possible with correlated classical sources. Extensions of the protocol to improve its security against eavesdropping are discussed.


Item Type:Article
Additional Information:©2000 The American Physical Society. Received 19 April 1993; revised 23 March 2000; published 15 September 2000. The authors gratefully acknowledge the comments of J.H. Shapiro, who pointed out the connection between our experiment and that of Ref. [44], and we thank S. L. Braunstein and H. Mabuchi for critical discussions. This work was supported by the Office of Naval Research, by the National Science Foundation, and by DARPA via the QUIC administered by the Army Research Office.
Subject Keywords:PODOLSKY-ROSEN PARADOX; NONDEGENERATE PARAMETRIC AMPLIFICATION; SHOT-NOISE LIMIT; OPTICAL COMMUNICATION; ERROR-CORRECTION; SQUEEZED-LIGHT; NONDEMOLITION MEASUREMENTS; CONTINUOUS-VARIABLES; PHASE MEASUREMENTS; TELEPORTATION
Issue or Number:4
Record Number:CaltechAUTHORS:PERpra00
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:PERpra00
Alternative URL:http://dx.doi.org/10.1103/PhysRevA.62.042311
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3077
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 May 2006
Last Modified:02 Oct 2019 22:59

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