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New protocols for non-orthogonal quantum key distribution |
| Zhou Yuan-Yuan (周媛媛), Zhou Xue-Jun (周学军), Tian Pei-Gen (田培根), Wang Ying-Jian (王瑛剑) |
| School of Electronic Engineering, Naval University of Engineering, Wuhan 430033, China |
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Abstract Combining passive decoy-state idea with active decoy-state idea, a non-orthogonal (SARG04) decoy-state protocol with one vacuum and two weak decoy states is introduced based on a heralded pair coherent state photon source for quantum key distribution. Two special cases of this protocol are deduced, i.e., one-vacuum-and-one-weak-decoy-state protocol and one-weak-decoy-state protocol. In these protocols, the sender prepares decoy states actively, which avoids the crude estimation of parameters in SARG04 passive decoy-state method. With passive decoy-state idea, the detection events on Bob's side that are non-triggered on Alice's side are not discarded, but used to estimate the fractions of single-photon and two-photon pulses, which offsets the limitation of the detector's low efficiency and overcomes the shortcoming that the performance of active decoy-state protocol severely depends on detector's efficiency of sender. The simulation results show that the combination of active and passive decoy-state idea increases the key generation rate. With one-vacuum-and-two-weak-decoy-state protocol, one can achieve a key generation rate that is close to the theoretical limit of an infinite decoy-state protocol. The performance of the other two protocols is a little less than with the former, but the implementation is easier. Under the same condition of implementation, higher key rates can be obtained with our protocols than with existing methods.
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Received: 01 June 2012
Revised: 09 July 2012
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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| Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2011AA7014061) and the Science Foundation of Naval University of Engineering, China (Grant No. HGDQNJJ11022). |
Corresponding Authors:
Zhou Yuan-Yuan
E-mail: zyy_hjgc@yahoo.com.cn
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Cite this article:
Zhou Yuan-Yuan (周媛媛), Zhou Xue-Jun (周学军), Tian Pei-Gen (田培根), Wang Ying-Jian (王瑛剑) New protocols for non-orthogonal quantum key distribution 2013 Chin. Phys. B 22 010305
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