Unconditionally Secure Key Distribution Based on Two Nonorthogonal States

Preprint

8 January 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.quant-ph/0212162

Abstract

We prove the unconditional security of the Bennett 1992 protocol, by using a reduction to an entanglement distillation protocol initiated by a local filtering process. The bit errors and the phase errors are correlated after the filtering, and we can bound the amount of phase errors from the observed bit errors by an estimation method involving nonorthogonal measurements. The angle between the two states shows a trade-off between accuracy of the estimation and robustness to noises.

Keywords

UNCONDITIONALLY SECURE
UNCONDITIONAL SECURITY
NONORTHOGONAL STATES
TWO NONORTHOGONAL
KEY DISTRIBUTION
SHOWS A TRADE
PHASE ERRORS
SECURE KEY

All Related Versions

Version 1, 2002-12-31, ArXiv
Version 2, 2003-01-08, ArXiv
Published version: Physical Review Letters, 90 (16), 167904.

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