Quantum Distribution of Gaussian Keys with Squeezed States

Details Quantum Distribution of Gaussian Keys with Squeezed States Quantum Distribution of Gaussian Keys with Squeezed States

2000-08-11

arxiv.org/abs/quant-ph/0008058v1

Phys. Rev. A 63, 052311 (2001)

Physics

Quantum Physics

5 pages, RevTex

Scientific paper

10.1103/PhysRevA.63.052311

A continuous key distribution scheme is proposed that relies on a pair of canonically 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 vs disturbance tradeoff 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.

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