Quantum cryptography with continuous alphabet

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A new quantum cryptography protocol, based on all unselected states of a qubit as a sort of alphabet with continuous set of letters, is proposed. Its effectiveness is calculated and shown to be essentially higher than those of the other known protocols.
14 pages, 3 figures, RevTeX, submitted to J. Optics B: Quantum and Semiclassical Optics (special issue to follow the IQEC-2002)

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