Security of biased BB84 quantum key distribution with finite resource  

作　　者：赵良圆 李宏伟 银振强 陈巍 尤娟 韩正甫 

机构地区：[1]Key Laboratory of Quantum Information, University of Science and Technology of China [2]Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China [3]Zhengzhou Information Science and Technology Institute

出　　处：《Chinese Physics B》2014年第10期24-31,共8页中国物理B（英文版）

基　　金：Project supported by the the National Natural Science Foundation of China(Grant Nos.61101137,61201239,61205118,and 11304397);the China Postdoctoral Science Foundation.(Grant No.2013M540514)

摘　　要：In the original BB84 quantum key distribution protocol, the states are prepared and measured randomly, which lose the unmatched detection results. To improve the sifting efficiency, biased bases selection BB84 protocol is proposed. Meanwhile, a practical quantum key distribution protocol can only transmit a finite number of signals, resulting in keys of finite length. The previous techniques for finite-key analysis focus mainly on the statistical fluctuations of the error rates and yields of the qubits. However, the prior choice probabilities of the two bases also have fluctuations by taking into account the finite-size effect. In this paper, we discuss the security of biased decoy state BB84 protocol with finite resources by considering all of the statistical fluctuations. The results can be directly used in the experimental realizations.In the original BB84 quantum key distribution protocol, the states are prepared and measured randomly, which lose the unmatched detection results. To improve the sifting efficiency, biased bases selection BB84 protocol is proposed. Meanwhile, a practical quantum key distribution protocol can only transmit a finite number of signals, resulting in keys of finite length. The previous techniques for finite-key analysis focus mainly on the statistical fluctuations of the error rates and yields of the qubits. However, the prior choice probabilities of the two bases also have fluctuations by taking into account the finite-size effect. In this paper, we discuss the security of biased decoy state BB84 protocol with finite resources by considering all of the statistical fluctuations. The results can be directly used in the experimental realizations.

关 键 词：biased basis selection security bound quantum key distribution 

分 类 号：O413[理学—理论物理] TN918.1[理学—物理]