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An optimized encoding method for secure key distribution by swapping quantum entanglement and its extension |
| Gao Gan (高干) |
| Department of Electrical Engineering, Tongling University, Tongling 244000, China |
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Abstract Song [Song D 2004 Phys. Rev. A 69 034301] first proposed two key distribution schemes with the symmetry feature. We find that, in the schemes, the private channels which Alice and Bob publicly announce the initial Bell state or the measurement result through are not needed in discovering keys, and Song's encoding methods do not arrive at the optimization. Here, an optimized encoding method is given so that the efficiencies of Song's schemes are improved by 7/3 times. Interestingly, this optimized encoding method can be extended to the key distribution scheme composed of generalized Bell states.
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Received: 30 December 2014
Revised: 15 February 2015
Accepted manuscript online:
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PACS:
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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03.67.-a
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(Quantum information)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11205115), the Program for Academic Leader Reserve Candidates in Tongling University (Grant No. 2014tlxyxs30), and the 2014-year Program for Excellent Youth Talents in University of Anhui Province, China. |
Corresponding Authors:
Gao Gan
E-mail: gaogan0556@163.com
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Cite this article:
Gao Gan (高干) An optimized encoding method for secure key distribution by swapping quantum entanglement and its extension 2015 Chin. Phys. B 24 080305
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