期刊
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
卷 53, 期 9, 页码 2891-2901出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10773-014-2087-8
关键词
Quantum cryptography; Quantum key agreement; Collective decoherence; Decoherence-free subspace
资金
- NSFC [61272057, 61170270, 61100203, 61003286, 61121061, 61103210]
- NCET [NCET-10-0260]
- SRFDP [2009000 5110010]
- CPSF [2013M530561]
- Beijing Natural Science Foundation [4112040, 4122054]
- Fundamental Research Funds for the Central Universities [2011YB01]
- BUPT Excellent Ph.D. Students Foundation [CX201334]
- Beijing Higher Education Young Elite Teacher Project [YETP0475, YETP0477]
A robust and efficient quantum key agreement (QKA) protocol is presented with decoherence-free (DF) states and single-particle measurements. Compared with all the previous QKA protocols, which are designed in ideal condition, this protocol can not only guarantee both the security and fairness of the shared key but also be immune to collective decoherence. In addition, our protocol has a high intrinsic efficiency due to the utilization of the delayed measurement technique. Finally, we show that the proposed protocol is secure against the attacks from both outside eavesdroppers and inside dishonest participants.
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