Secrecy content of two-qubit states

Details Secrecy content of two-qubit states Secrecy content of two-qubit states

2004-11-12

arxiv.org/abs/quant-ph/0411092v1

Phys. Rev. A 73, 012327 (2006)

Physics

Quantum Physics

5 pages, RevTeX

Scientific paper

We analyze the set of two-qubit states from which a secret key can be extracted by single-copy measurements plus classical processing of the outcomes. We introduce a key distillation protocol and give the corresponding necessary and sufficient condition for positive key extraction. Our results imply that the critical error rate derived by Chau, Phys. Rev. A {\bf 66}, 060302 (2002), for a secure key distribution using the six-state scheme is tight. Remarkably, an optimal eavesdropping attack against this protocol does not require any coherent quantum operation.

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