On the Security of Quantum Cryptography Against Collective Attacks

Details On the Security of Quantum Cryptography Against Collective Attacks On the Security of Quantum Cryptography Against Collective Attacks

1996-05-11

arxiv.org/abs/quant-ph/9605007v2

Physics

Quantum Physics

10 pages, RevTeX. New version. To be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.78.2256

We present strong attacks against quantum key distribution schemes which use quantum memories and quantum gates to attack directly the final key. We analyze a specific attack of this type, for which we find the density matrices available to the eavesdropper and the optimal information which can be extracted from them. We prove security against this attack and discuss security against any attack allowed by the rules of quantum mechanics.

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