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Proceedings Paper

Relativistic quantum cryptography
Author(s): S. N. Molotkov; S. S. Nazin
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Paper Abstract

The problem of unconditional security of quantum cryptography (i.e. the security which is guaranteed by the fundamental laws of nature rather than by technical limitations) is one of the central points in quantum information theory. We propose a relativistic quantum cryptosystem and prove its unconditional security against any eavesdropping attempts. Relativistitic causality arguments allow to demonstrate the security of the system in a simple way. Since the proposed protocol does not empoly collective measurements and quantum codes, the cryptosystem can be experimentally realized with the present state-of-art in fiber optics technologies. The proposed cryptosystem employs only the individual measurements and classical codes and, in addition, the key distribution problem allows to postpone the choice of the state encoding scheme until after the states are already received instead of choosing it before sending the states into the communication channel (i.e. to employ a sort of "antedate" coding).

Paper Details

Date Published: 23 July 2003
PDF: 9 pages
Proc. SPIE 5128, First International Symposium on Quantum Informatics, (23 July 2003); doi: 10.1117/12.517871
Show Author Affiliations
S. N. Molotkov, Institute of Solid State Physics (Russia)
M.V. Lomonosov Moscow State Univ. (Russia)
S. S. Nazin, Institute of Solid State Physics (Russia)

Published in SPIE Proceedings Vol. 5128:
First International Symposium on Quantum Informatics
Yuri I. Ozhigov, Editor(s)

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