A " quantum public key " based cryptographic scheme for continuous variables

Details A " quantum public key " based cryptographic scheme for continuous variables A " quantum public key " based cryptographic scheme for continuous variables

2001-01-23

arxiv.org/abs/quant-ph/0101113v1

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

By analogy to classical cryptography, we develop a "quantum public key" based cryptographic scheme in which the two public and private keys consist in each of two entangled beams of squeezed light. An analog message is encrypted by modulating the phase of the beam sent in public. The knowledge of the degree of non classical correlation between the beam quadratures measured in private and in public allows only the receiver to decrypt the message. Finally, in a view towards absolute security, we formally prove that any external intervention of an eavesdropper makes him vulnerable to any subsequent detection.

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