Physics – Quantum Physics
Scientific paper
1999-09-09
Phys. Rev. A62,062308(2000)
Physics
Quantum Physics
11 pages,3 figures, changes are important,presented at QELS(May,2000) San Francisco
Scientific paper
10.1103/PhysRevA.62.062308
Correlations of the type discussed by EPR in their original 1935 paradox for continuous variables exist for the quadrature phase amplitudes of two spatially separated fields. These correlations were experimentally reported in 1992. We propose to use such EPR beams in quantum cryptography, to transmit with high efficiency messages in such a way that the receiver and sender may later determine whether eavesdropping has occurred. The merit of the new proposal is in the possibility of transmitting a reasonably secure yet predetermined key. This would allow relay of a cryptographic key over long distances in the presence of lossy channels.
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