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Lower and Upper Bounds on the Secret-Key Rate for Quantum Key Distribution Protocols Using One-Way Classical Communication

Published inPhysical review letters, vol. 95, no. 8
Publication date2005
Abstract

We investigate a general class of quantum key distribution (QKD) protocols using one-way classical communication. We show that full security can be proven by considering only collective attacks. We derive computable lower and upper bounds on the secret-key rate of those QKD protocols involving only entropies of two-qubit density operators. As an illustration of our results, we determine new bounds for the Bennett-Brassard 1984, the 6-state, and the Bennett 1992 protocols. We show that in all these cases the first classical processing that the legitimate partners should apply consists in adding noise.

Citation (ISO format)
KRAUS, Barbara, GISIN, Nicolas, RENNER, R. Lower and Upper Bounds on the Secret-Key Rate for Quantum Key Distribution Protocols Using One-Way Classical Communication. In: Physical review letters, 2005, vol. 95, n° 8. doi: 10.1103/PhysRevLett.95.080501
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ISSN of the journal0031-9007
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