Phys. Rev. A 63, 052311 (2001) [5 pages]Quantum distribution of Gaussian keys using squeezed statesReceived 26 October 2000; published 18 April 2001 A continuous key-distribution scheme is proposed that relies on a pair of conjugate quantum variables. It allows two remote parties to share a secret Gaussian key by encoding it into one of the two quadrature components of a single-mode electromagnetic field. The resulting quantum cryptographic information versus disturbance trade-off is investigated for an individual attack based on the optimal continuous cloning machine. It is shown that the information gained by the eavesdropper then simply equals the information lost by the receiver. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.63.052311
DOI:
10.1103/PhysRevA.63.052311
PACS:
03.67.Dd, 03.65.Ta, 42.50.-p, 89.70.+c
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