SUPPLEMENT ISSUE – Proceedings of the 1st Asia-Pacific Conference on Quantum Information Science Tainan, Taiwan, December 10—13, 2004; Editors: Chopin Soo and Wei-Min Zhang (National Cheng Kung University, Taiwan)No Access

SECURITY OF QUANTUM KEY DISTRIBUTION WITH STRONG PHASE-REFERENCE PULSE

MASATO KOASHI

MASATO KOASHI

Division of Materials Physics, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan

CREST Photonic Quantum Information Project, 4-1-8 Honmachi, Kawaguchi, 331-0012, Japan

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https://doi.org/10.1142/S0219749905001262Cited by:0 (Source: Crossref)

Abstract

In the BB84 protocol with a perfect single photon source, the key rate decreases linearly with the transmission η of the channel. If we simply replace this source with a weak coherent-state pulse, the key rate drops more rapidly (as O(η²)) since the presence of multiple photons favors the eavesdropper. Here we discuss the unconditional security of a quantum key distribution protocol in which bit values are encoded in the phase of a weak coherent-state pulse relative to a strong reference pulse, which is essentially the one proposed by Bennett in 1992 (the B92 scheme). We show that in the limit of high loss in the transmission channel, we can construct a secret key with a rate proportional to the transmission η of the channel.

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SECURITY OF QUANTUM KEY DISTRIBUTION WITH STRONG PHASE-REFERENCE PULSE

Abstract

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