Getting something out of nothing

Authors:
Hoi-Kwong Lo
Affiliations:
Center for Quantum Information and Quantum Control, Dept. of Electrical & Computer Engineering & Dept. of Physics, University of Toronto, Toronto, Ontario, Canada
Venue:
Quantum Information & Computation
Year:
2005

Citing 5
Cited 0

Quantum Key Distribution and String Oblivious Transfer in Noisy Channels

CRYPTO '96 Proceedings of the 16th Annual International Cryptology Conference on Advances in Cryptology
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Universally composable privacy amplification against quantum adversaries

TCC'05 Proceedings of the Second international conference on Theory of Cryptography
Proof of security of quantum key distribution with two-way classical communications

IEEE Transactions on Information Theory

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Abstract

We study quantum key distribution with standard weak coherent states and show, rather counter-intuitively, that the detection events originated from vacua can contribute to secure key generation rate, over and above the best prior art result. Our proof is based on a communication complexity/quantum memory argument. The key observation is that Eve does not have to store anything, if Alice sends out a vacuum state.