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Secure Quantum Key Distribution with an Uncharacterized Source

Koashi, Masato and Preskill, John (2003) Secure Quantum Key Distribution with an Uncharacterized Source. Physical Review Letters, 90 (5). Art. No. 057902. ISSN 0031-9007.

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We prove the security of the Bennett-Brassard (BB84) quantum key distribution protocol for an arbitrary source whose averaged states are basis independent, a condition that is automatically satisfied if the source is suitably designed. The proof is based on the observation that, to an adversary, the key extraction process is equivalent to a measurement in the sigma-hatx basis performed on a pure sigma-hatz-basis eigenstate. The dependence of the achievable key length on the bit error rate is the same as that established by Shor and Preskill [Phys. Rev. Lett. 85, 441 (2000)] for a perfect source, indicating that the defects in the source are efficiently detected by the protocol.

Item Type:Article
Additional Information:©2003 The American Physical Society (Received 27 August 2002; published 6 February 2003) We thank David DiVincenzo, Peter Shor, Andy Yao, and especially Daniel Gottesman and Hoi-Kwong Lo for helpful discussions. This work has been supported in part by the Department of Energy under Grant No. DE-FG03-92-ER40701, by the National Science Foundation under Grant No. EIA-0086038, and by the Caltech MURI Center for Quantum Networks under ARO Grant No. DAAD19-00-1-0374.
Subject Keywords:quantum cryptography; security; protocols
Record Number:CaltechAUTHORS:KOAprl03
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2022
Deposited By: Archive Administrator
Deposited On:02 Mar 2006
Last Modified:18 Sep 2014 18:11

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