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High Efficient Quantum Key Distribution by Random Using Classified Signal Coherent States |
| 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 1375-1378 |
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Abstract The decoy-state method is a useful method in resisting the attacks on quantum key distribution. However, how to choose the intensities of decoy states and the ratio of the decoy states and the signal state is still an open question. We present a simple formula to analyse the problem. We also give a simple method to derive the bounds of the necessary counting rates and quantum bit error rates for BB84 and SARG04; the latter was previously proposed by Scarani et al. [Phys. Rev. Lett. 92(2004)057901] We then propose a multi-signal-state method which employs different coherent states either as the decoy state or as the signal state to carry out quantum key distribution. We find our protocol more efficient and feasible.
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| Keywords:
03.67.Dd
02.50.Cw
02.60.Cb
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Published: 01 June 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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