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Dense coding for continuous variables

Braunstein, Sameul L. and Kimble, H. J. (2000) Dense coding for continuous variables. Physical Review A, 61 (4). Art. No. 042302. ISSN 1050-2947.

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A scheme to achieve dense quantum coding for the quadrature amplitudes of the electromagnetic field is presented. The protocol utilizes shared entanglement provided by nondegenerate parametric down-conversion in the limit of large gain to attain high efficiency. For a constraint in the mean number of photons n̄ associated with modulation in the signal channel, the channel capacity for dense coding is found to be ln(1+n̄+n2), which always beats coherent-state communication and surpasses squeezed-state communication for n̄>1. For n̄≫1, the dense coding capacity approaches twice that of either scheme.

Item Type:Article
Additional Information:©2000 The American Physical Society Received 3 May 1999; published 3 March 2000 S.L.B. was supported in part by the UK Engineering and Physical Sciences Research Council and the Royal Academy of Engineering. The work of H.J.K. is supported by DARPA via the QUIC Institute which is administered by ARO, by the Office of Naval Research, and by the National Science Foundation.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2054
Deposited By: Archive Administrator
Deposited On:05 Mar 2006
Last Modified:26 Dec 2012 08:47

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