Quantum Communication with Correlated Nonclassical States

Details Quantum Communication with Correlated Nonclassical States Quantum Communication with Correlated Nonclassical States

2000-03-21

arxiv.org/abs/quant-ph/0003094v1

Physics

Quantum Physics

8 pages and 4 figures (Figure 1; Figures 2a, 2b; Figure 2)

Scientific paper

10.1103/PhysRevA.62.042311

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.

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