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基于弱相干光源测量设备无关量子密钥分发系统的误码率分析

杜亚男 解文钟 金璇 王金东 魏正军 秦晓娟 赵峰 张智明

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基于弱相干光源测量设备无关量子密钥分发系统的误码率分析

杜亚男, 解文钟, 金璇, 王金东, 魏正军, 秦晓娟, 赵峰, 张智明

Analysis on quantum bit error rate in measurement-device-independent quantum key distribution using weak coherent states

Du Ya-Nan, Xie Wen-Zhong, Jin Xuan, Wang Jin-Dong, Wei Zheng-Jun, Qin Xiao-Juan, Zhao Feng, Zhang Zhi-Ming
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  • 测量设备无关量子密钥分发系统可以免疫任何针对探测器边信道的攻击, 并进一步结合诱惑态方法规避了准单光子源引入的实际安全性问题. 目前实验中一般采用弱相干光源, 但是该光源含有一定比例的空脉冲和多光子脉冲. 本文针对弱相干光源的具体特性, 采用量子力学的描述, 将各个器件进行量子化处理, 并同时考虑探测器的具体性能参数的影响, 分别给出了通信双方各自发送的脉冲含有特定光子数时产生的成功贝尔态和错误贝尔态的概率公式, 从理论上对相位编码和偏振编码测量设备无关量子密钥分发系统的误码率进行了定量分析, 分别推导并模拟了通信双方采用的平均光子数对称和不对称时误码率随传输距离的变化情况, 结果表明在偏振编码Z基中, 多光子脉冲不会引起误码; 在偏振编码X基和相位编码中, 受多光子影响, 产生的误码率较大. 对于不同的编码方式, 误码率均随传输距离的增加有不同程度的升高, 长距离传输时, 平均光子数越小, 产生的误码率越大; 在偏振编码X基和相位编码的短距离传输中, 相对于对称, 通信双方采用的平均光子数不对称时产生的误码率较大.
    A measurement-device-independent quantum key distribution (MDI-QKD) protocol is immune to all detection side-channel attacks and guarantees the information-theoretical security even with uncharacterized single photon detectors. A weak coherent source is used in the current MDI-QKD experiments, it inevitably contains a certain percentage of vacuum and multi-photon pulses. The security issues introduced by these source imperfections can be avoided by applying the decoy state method. Here, through modeling experimental devices, and taking into account the weak coherent source and the threshold detectors, we have evaluated the gain, the probability to get successful Bell measurement and incorrect Bell measurement, and the quantum bit error rate (QBER), given a practical setup. In our simulation, we show how QBER varies with different transmission distances in the cases when the average photon numbers per pulse from Alice and Bob are symmetric and asymmetric. Result shows that the multi-photon pulses do not cause error in the Z basis of polarization encoding scheme, but produce a large QBER in phase encoding scheme and in the X basis of polarization encoding scheme. QBER is affected by the dark count rate and the system optical error associated with the multi-photon pulses. For different encoding schemes, QBER caused by each kind of average photon numbers from Alice and Bob increases to different degrees with the transmission distance, and finally is close to 50%. With the increase of the transmission distance, the average photon number per pulse decreases and the fraction of the dark count rate causing QBER gradually increases. Under the same effect of the dark count rate, the smaller the average photon number per pulse, the bigger the QBER. After a certain transmission and at the same transmission distance, the QBER is largest when average photon numbers used by Alice and Bob are both smallest. For the short distance transmission of phase encoding scheme and the X basis, we find that QBER is larger when average photon numbers from the two arms are asymmetric, as compared to the symmetric case. For the Z basis, the QBER caused by the system optical error and the dark count rate is very small.
    • 基金项目: 国家自然科学基金(批准号:61378012,61401262,11374107)、国家自然科学基金重大研究计划(批准号:91121023)、国家重点基础研究发展计划(973计划)(批准号:2011CBA00200,2013CB921804)、教育部长江学者和创新团队发展计划(批准号:IRT1243)和高等学校博士学科点专项科研基金(批准号:20124407110009)资助的课题.
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 61378012, 61401262, 11374107), the Major Research Plan of the National Natural Science Foundation of China(Grant No. 91121023), the National Basic Research Program of China (Grant Nos. 2011CBA00200, 2013CB921804), the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (Grant No. IRT1243), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20124407110009).
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    Gisin N, Ribordy G, Tittel W, Zbinden H 2002 Rev. Mod. Phys. 74 145

    [2]

    Li M, Patcharapong T, Zhang C M, Yin Z Q, Chen W, Han Z F 2015 Chin. Phys. B 24 010302

    [3]

    Ma H Q, Wei K J, Yang J H, Li R X, Zhu W 2014 Chin. Phys. B 23 100307

    [4]

    Chen W F, Wei Z J, Guo L, Hou L Y, Wang G, Wang J D, Zhang Z M, Guo J P, Liu S H 2014 Chin. Phys. B 23 080304

    [5]

    Zhou Y Y, Zhou X J, Tian P G, Wang Y J 2013 Chin. Phys. B 22 010305

    [6]

    Zhou R R, Y L 2012 Chin. Phys. B 21 080301

    [7]

    Lo H K, Chau H F 1999 Science 283 2050

    [8]

    Shor P W, Preskill J 2000 Phys. Rev. Lett. 85 441

    [9]

    Mayers D 2001 J. ACM 48 351

    [10]

    Makarov V, Anisimov A, Skaar J 2006 Phys. Rev. A 74 022313

    [11]

    Zhao Y, Fung C H F, Qi B, Chen C, Lo H K 2008 Phys. Rev. A 78 042333

    [12]

    Fung C H F, Qi B, Tamaki K, Lo H K 2007 Phys. Rev. A 75 032314

    [13]

    Jain N, Wittmann C, Lydersen L, Wiechers C, Elser D, Marquardt C, Makarov V, Leuchs G 2011 Phys. Rev. Lett. 107 110501

    [14]

    Acín A, Brunner N, Gisin N, Massar S, Pironio S, Scarani V 2007 Phys. Rev. Lett. 98 230501

    [15]

    Gisin N, Pironio S, Sangouard N 2010 Phys. Rev. Lett. 105 070501

    [16]

    Lo H K, Curty M, Qi B 2012 Phys. Rev. Lett. 108 130503

    [17]

    Ma X, Razavi M 2012 Phys. Rev. A 86 062319

    [18]

    Tang Y L, Yin H L, Chen S J, Liu Y, Zhang W J, Jiang X, Zhang L, Wang J, You L X, Guan J Y, Yang D X, Wang Z, Liang H, Zhang Z, Zhou N, Ma X, Chen T Y, Zhang Q, Pan J W 2015 IEEE J. Select. Topics Quantum Electron. 21 6600407

    [19]

    Zhou C, Bao W S, Chen W, Li H W, Yin Z Q, Wang Y, Han Z F 2013 Phys. Rev. A 88 052333

    [20]

    Wang Y, Bao W S, Li H W, Zhou C, Li Y 2014 Chin. Phys. B 23 080303

    [21]

    Dong C, Zhao S H, Zhao W H, Shi L, Zhao G H 2014 Acta Phys. Sin. 63 030302 (in Chinese) [东晨, 赵尚弘, 赵卫虎, 石磊, 赵顾灏 2014 物理学报 63 030302]

    [22]

    Liu Y, Chen T Y, Wang L J, Liang H, Shentu G L, Wang J, Cui K, Yin H L, Liu N L, Li L, Ma X, Pelc J S, Fejer M M, Peng C Z, Zhang Q, Pan J W 2013 Phys. Rev. Lett. 111 130502

    [23]

    da Silva T F, Vitoreti D, Xavier G B, do Amaral G C, Tempor o G P, von der Weid J P 2013 Phys. Rev. A 88 052303

    [24]

    Wang Q, Wang X B 2013 Phys. Rev. A 88 052332

    [25]

    Dong C, Zhao S H, Zhang N, Dong Y, Zhao W H, Liu Y 2014 Acta Phys. Sin. 63 200304 (in Chinese) [东晨, 赵尚弘, 张宁, 董毅, 赵卫虎, 刘韵 2014 物理学报 63 200304]

    [26]

    Li M, Zhang C M, Yin Z Q, Chen W, Wang S, Guo G C, Han Z F 2014 Opt. Lett. 39 880

    [27]

    Ma X, Fung C H F, Razavi M 2012 Phys. Rev. A 86 052305

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出版历程
  • 收稿日期:  2014-10-21
  • 修回日期:  2015-01-02
  • 刊出日期:  2015-06-05

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