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Phys. Rev. A 75, 060303(R) (2007) [4 pages]

Coherent communication with continuous quantum variables

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Mark M. Wilde1,*, Hari Krovi2, and Todd A. Brun2
1Signal and Image Processing Institute, Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA
2Communication Sciences Institute, Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA

Received 28 December 2006; published 14 June 2007

The coherent bit (cobit) channel is a resource intermediate between classical and quantum communication. It produces coherent versions of teleportation and superdense coding. We extend the cobit channel to continuous variables by providing a definition of the coherent nat (conat) channel. We construct several coherent protocols that use both a position-quadrature and a momentum-quadrature conat channel with finite squeezing. Finally, we show that the quality of squeezing diminishes through successive compositions of coherent teleportation and superdense coding.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.75.060303
DOI:
10.1103/PhysRevA.75.060303
PACS:
03.67.Hk, 42.50.Dv

*mark.wilde@usc.edu

 
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