Nonorthogonal decoy-state Quantum Key Distribution

Details Nonorthogonal decoy-state Quantum Key Distribution Nonorthogonal decoy-state Quantum Key Distribution

2005-09-11

arxiv.org/abs/quant-ph/0509077v2

Physics

Quantum Physics

4 pages, 1 figure; Revtex4, submitted to PRL

Scientific paper

10.1088/0256-307X/23/4/004

In practical quantum key distribution (QKD), weak coherent states as the photon sources have a limit in secure key rate and transmission distance because of the existence of multiphoton pulses and heavy loss in transmission line. Decoy states method and nonorthogonal encoding protocol are two important weapons to combat these effects. Here, we combine these two methods and propose a efficient method that can substantially improve the performance of QKD. We find a 79 km increase in transmission distance over the prior record using decoy states method.

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