Large N Quantum Cryptography

Details Large N Quantum Cryptography Large N Quantum Cryptography

2002-12-08

arxiv.org/abs/quant-ph/0212043v1

in "Quantum Communication, Measurement and Computing (QCMC'02)", J. Shapiro and O. Hirota (eds), Rinton Press (2003)

Physics

Quantum Physics

6 pages. To appear in Proceedings of QCMC02

Scientific paper

In quantum cryptography, the level of security attainable by a protocol which implements a particular task $N$ times bears no simple relation to the level of security attainable by a protocol implementing the task once. Useful partial security, and even near-perfect security in an appropriate sense, can be obtained for $N$ copies of a task which itself cannot be securely implemented. We illustrate this with protocols for quantum bit string commitment and quantum random number generation between mistrustful parties.

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