Quantum Key Distribution with High Loss: Toward Global Secure Communication

Preprint

19 May 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.quant-ph/0211153

Abstract

We propose a decoy-state method to overcome the photon-number-splitting attack for Bennett-Brassard 1984 quantum key distribution protocol in the presence of high loss: A legitimate user intentionally and randomly replaces signal pulses by multi-photon pulses (decoy-states). Then they check the loss of the decoy-states. If the loss of the decoy-states is abnormally less than that of signal pulses, the whole protocol is aborted. Otherwise, to continue the protocol, they estimate loss of signal multi-photon pulses based on that of decoy-states. This estimation can be done with an assumption that the two losses have similar values, that we justify.

Keywords

QUANTUM KEY DISTRIBUTION
PHOTON PULSES
INTENTIONALLY
DECOY STATES
HIGH LOSS
ABORTED

All Related Versions

Version 1, 2002-11-24, ArXiv
Version 2, 2002-11-26, ArXiv
Version 3, 2003-03-08, ArXiv
Version 4, 2003-04-14, ArXiv
Version 5, 2003-05-19, ArXiv
Published version: Physical Review Letters, 91 (5), 057901.

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