Unconditional privacy over channels which cannot convey quantum information

Details Unconditional privacy over channels which cannot convey quantum information Unconditional privacy over channels which cannot convey quantum information

2007-02-08

arxiv.org/abs/quant-ph/0702077v1

Phys. Rev. Lett. 100, 110502 (2008)

Physics

Quantum Physics

Related to quant-ph/0608195 and for a more general audience

Scientific paper

10.1103/PhysRevLett.100.110502

By sending systems in specially prepared quantum states, two parties can communicate without an eavesdropper being able to listen. The technique, called quantum cryptography, enables one to verify that the state of the quantum system has not been tampered with, and thus one can obtain privacy regardless of the power of the eavesdropper. All previous protocols relied on the ability to faithfully send quantum states. In fact, until recently, they could all be reduced to a single protocol where security is ensured though sharing maximally entangled states. Here we show this need not be the case -- one can obtain verifiable privacy even through some channels which cannot be used to reliably send quantum states.

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