Statistical confidentiality tests for a quantum transmission using continuous variables |
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Authors: | P Navez |
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Institution: | (1) INFM, Dipartimento di Scienze CC FF MM, Universita degli Studi dell'Insubria, Via Valleggio 11, 22100 COMO, Italy, IT |
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Abstract: | We describe a cryptographic protocol consisting of two entangled beams of squeezed light which makes use of statistical tests
to deduce the secret key bit. The sender (Alice) encrypts a secret key by modulating the phase of the beam sent in public
by the receiver (Bob) who keeps the other beam private. The knowledge of the degree of non classical correlation between the
beam quadrature components measured in private and in public allows only Bob to decrypt the secret key. With a view towards
absolute security, we formally prove that any external intervention from an eavesdropper (Eve) during the communication process
introduces necessarily some modification susceptible to be detected. Statistical confidentiality tests are proposed to detect
the presence of Eve.
Received 12 July 2001 and Received in final form 11 November 2001 |
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Keywords: | PACS 03 67 Dd Quantum cryptography – 03 67 Hk Quantum communication – 42 65 -k Nonlinear optics |
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