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Nonorthogonal Decoy-State Quantum Key Distribution |
| LI Jing-Bo;FANG Xi-Ming |
| Department of Physics, Hunan Normal University, Changsha 410081 |
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| Cite this article: |
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LI Jing-Bo, FANG Xi-Ming 2006 Chin. Phys. Lett. 23 775-778 |
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Abstract In practical quantum key distribution (QKD), weak coherent states as the photon source have a limit in the secure key rate and transmission distance because of the existence of multi-photon pulses and heavy loss in transmission line. The decoy-state method and the nonorthogonal encoding protocol are two important methods to combat these effects. Here, we combine both the methods and propose an efficient method that can substantially improve the performance of QKD. We find a 78-km increase over the prior record using the decoy-state method and a 123-km increase over the result of the SARG04 protocol in transmission distance.
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| Keywords:
03.67.Dd
02.50.Cw
02.60.Cb
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Published: 01 April 2006
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| PACS: |
03.67.Dd
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(Quantum cryptography and communication security)
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02.50.Cw
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(Probability theory)
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02.60.Cb
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(Numerical simulation; solution of equations)
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