Continuous Variable Quantum Cryptography - beating the 3 dB loss limit

Preprint

19 August 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.quant-ph/0204064

Abstract

We demonstrate that secure quantum key distribution systems based on continuous variables implementations can operate beyond the apparent 3 dB loss limit that is implied by the beam splitting attack . The loss limit was established for standard minimum uncertainty states such as coherent states. We show that by an appropriate postselection mechanism we can enter a region where Eve's knowledge falls behind the information shared between Alice and Bob even in the presence of substantial losses.

Keywords

QUANTUM CRYPTOGRAPHY
CONTINUOUS VARIABLES
DISTRIBUTION SYSTEMS
VARIABLE QUANTUM
DB LOSS LIMIT
UNCERTAINTY
LOSS LIMIT
KNOWLEDGE

All Related Versions

Version 1, 2002-04-11, ArXiv
Version 2, 2002-06-12, ArXiv
Version 3, 2002-08-19, ArXiv
Published version: Physical Review Letters, 89 (16), 167901.

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