New protocols for non-orthogonal quantum key distribution |
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| Authors: | Zhou Yuan-Yuan Zhou Xue-Jun Tian Pei-Gen and Wang Ying-Jian |
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| Affiliation: | 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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| Keywords: | quantum key distribution non-orthogonal encoding protocol active decoy state passive decoy state |
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