Quantum Communication with Correlated Nonclassical States
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.
Cite
@article{arxiv.quant-ph/0003094,
title = {Quantum Communication with Correlated Nonclassical States},
author = {S. F. Pereira and Z. Y. Ou and H. J. Kimble},
journal= {arXiv preprint arXiv:quant-ph/0003094},
year = {2009}
}
Comments
8 pages and 4 figures (Figure 1; Figures 2a, 2b; Figure 2)