Phys. Rev. Lett. 77, 2818–2821 (1996)Quantum Privacy Amplification and the Security of Quantum Cryptography over Noisy ChannelsSee Also: Erratum Received 26 April 1996; published in the issue dated 23 September 1996 Existing quantum cryptographic schemes are not, as they stand, operable in the presence of noise on the quantum communication channel. Although they become operable if they are supplemented by classical privacy-amplification techniques, the resulting schemes are difficult to analyze and have not been proved secure. We introduce the concept of quantum privacy amplification and a cryptographic scheme incorporating it which is provably secure over a noisy channel. The scheme uses an “entanglement purification” procedure which, because it requires only a few quantum controlled-not and single-qubit operations, could be implemented using technology that is currently being developed. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.2818
DOI:
10.1103/PhysRevLett.77.2818
PACS:
89.70.+c, 02.50.-r, 03.65.Bz, 89.80.+h
See AlsoErratum: David Deutsch, Artur Ekert, Richard Jozsa, Chiara Macchiavello, Sandu Popescu, and Anna Sanpera, Erratum: Quantum Privacy Amplification and the Security of Quantum Cryptography over Noisy Channels [Phys. Rev. Lett. 77, 2818 (1996)], Phys. Rev. Lett. 80, 2022 (1998). |
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