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基于相位匹配的量子行走搜索算法及电路实现

陈汉武 李科 赵生妹

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基于相位匹配的量子行走搜索算法及电路实现

陈汉武, 李科, 赵生妹

Quantum walk search algorithm based on phase matching and circuit cmplementation

Chen Han-Wu, Li Ke, Zhao Sheng-Mei
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  • 量子行走是经典随机行走在量子力学框架下的对应, 理论上可以用来解决一类无序数据库的搜索问题. 因为携带信息的量子态的扩散速度与经典相比有二次方式的增长, 所以量子行走优于经典随机行走, 量子行走的特性值得加以利用. 量子行走作为一种新发现的物理现象的数学描述, 引发了一种新的思维方式, 孕育了一种新的理论计算模型. 最新研究表明, 量子行走本身也是一种通用计算模型, 可被视为设计量子算法的高级工具, 因此受到部分计算机理论科学领域学者的关注和研究. 对于多数问题求解方案的量子算法的设计, 理论上可以只在量子行走模型下进行考虑. 基于Grover算法的相位匹配条件, 本文提出了一个新的基于量子行走的搜索算法. 理论演算表明: 一般情况下本算法的时间复杂度与Grover算法相同, 但是当搜索的目标数目多于总数的1/3时, 本算法搜索成功的概率要大于Grover算法. 本文不但利用Grover算法中相位匹配条件构造了一个新的量子行走搜索算法, 而且在本研究室原有的量子电路设计研究成果的基础上给出了该算法的量子电路表述.
    As a new quantum computing model, quantum walk has been widely studied in recent years. It consists of discrete time quantum walk and continuous time quantum walk. Discrete time quantum walk includes coin quantum walk and scattering quantum walk. Meanwhile as a quantum search algorithm, Grover algorithm can search an unsorted database in time complexity of O(√N) . Recent years quantum walk has been used to solve search problems and some of them have been proved to be as efficient as Grover algorithm. Making full use of the novel properties of quantum walk, the quantum walk search algorithms on the 2D grid and hypercube have been proposed. Inspired by phase matching condition of Grover algorithm, we propose a new quantum walk search algorithm which is based on coin quantum walk. Firstly we give the graph to the quantum walk, and then describe the algorithm in detail. Algorithm uses different coin operators and shift operators for two different cases and draws the corresponding iteration operators. Then we prove that iteration operators used in the algorithm are unitary operators. Then we analyze the time complexity and probability of success of the algorithm. Analysis indicates that the time complexity of the algorithm is the same as that of Grover algorithm, however when the targets to be searched are more than 1/3 of the total targets, the algorithm probability of success is greater than that of Grover algorithm. Finally we give the circuit implementation of the algorithm.
      通信作者: 陈汉武, hanwu_chen@163.com
    • 基金项目: 国家自然科学基金(批准号: 61170321, 61271238, 61475075)和高等学校博士学科点专项科研基金(批准号: 20110092110024, 20123223110003)资助的课题.
      Corresponding author: Chen Han-Wu, hanwu_chen@163.com
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 61170321, 61271238, 61475075) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant Nos. 20110092110024, 20123223110003).
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    Shor P W 1997 SIAM J. Comput. 26 1484

    [2]

    Grover L K 1996 Proceedings of 28th ACM Symposium on Theory of Computation Philadelphia, USA, May 22-24, 1996 p212

    [3]

    Long G L 2001 Phys. Rev. A 64 022307

    [4]

    Toyama F M, van Dijk W, Nogami Y 2013 Quantum Inf. Process. 12 5

    [5]

    Liu Y, Zhang F H 2015 Sci. China: Phys. Mech. Astron. 58 7

    [6]

    Ambainis A, Bach E, Nayak A, Vishwanath A, Watrous J 2001 Proceedings of the 33th ACM Symposium on Theory of Computing Heraklion, Greece, July 6-8, 2001 p37

    [7]

    Aharonov D, Ambainis A, Kempe J, Vazirani U 2001 Proceedings of the 33th ACM Symposium on Theory of Computing Heraklion, Greece, July 6-8, 2001 p50

    [8]

    Childs A M, Farhi E, Gutmann S 2002 Quantum Inf. Process. 1 35

    [9]

    Hillery M, Bergou J, Feldman E 2003 Phys. Rev. A 68 032314

    [10]

    Ambainis A, Kempe J, Rivosh A 2005 Proceedings of the 16th Annual ACM-SIAM Symposium on Discrete Algorithms Philadelphia, USA, January 23-25, 2005 p1099

    [11]

    Shenvi N, Kempe J, Whaley K B 2003 Phys. Rev. A 67 052307

    [12]

    Potoček V, Gábris A, Kiss T, Jex I 2009 Phys. Rev. A 79 012325

    [13]

    Reitzner D, Hillery M, Feldman E, Buzek V 2009 Phys. Rev. A 79 012323

    [14]

    Liu Y M, Chen H W, Liu Z H, Xue X L, Zhu W N 2015 Acta Phys. Sin. 64 010301 (in Chinese) [刘艳梅, 陈汉武, 刘志昊, 薛希玲, 朱皖宁 2015 物理学报 64 010301]

    [15]

    Kempe J 2005 Probability Theory and Related Fields 133 215

    [16]

    Wang H, Ma Z, Ma C G 2013 Chin. Sci. Bull. 58 28

    [17]

    Travaglione B C, Milburn G J 2002 Phys. Rev. A 65 3

    [18]

    WANG C, LI Y S, HAO L 2011 Chin. Sci. Bull. 56 20

    [19]

    Xue P, Zhang R, Qin H, Zhan X, Bian Z H, Li J, Sanders B C 2015 Phys. Rev. Lett. 114 140502

    [20]

    Ambainis A 2007 SIAM J. Comput. 37 210

    [21]

    Childs A M, Eisenberg J M 2005 Quantum Inf. Comput. 5 593

    [22]

    Childs A M, Farhi E, Gutmann S 2002 Quantum Inf. Process. 1 35

    [23]

    Long G L, Liu Y 2007 Front. Comput. Sci. 1 3

    [24]

    Nielsen M A, Chuang I L 2000 Quantum Computation and Quantum Information (Cambridge: Cambridge University Press)

    [25]

    Fredkin E, Toffoli T 1982 Int. J. Theor. Phys. 21 219

    [26]

    Toffoli T 1981 Math. Syst. Theory 14 13

    [27]

    Grover L K 1998 Phys. Rev. Lett. 80 4329

    [28]

    Long G L, Li Y S, Zhang W L, Niu L 1999 Phys. Lett. A 262 27

    [29]

    Younes A 2007 Appl. Math. Informat. 7 93

    [30]

    Li P C, Li S Y 2007 Phys. Lett. A 366 42

    [31]

    Long G L, Li X, Sun Y 2002 Phys. Lett. A 294 3

  • [1]

    Shor P W 1997 SIAM J. Comput. 26 1484

    [2]

    Grover L K 1996 Proceedings of 28th ACM Symposium on Theory of Computation Philadelphia, USA, May 22-24, 1996 p212

    [3]

    Long G L 2001 Phys. Rev. A 64 022307

    [4]

    Toyama F M, van Dijk W, Nogami Y 2013 Quantum Inf. Process. 12 5

    [5]

    Liu Y, Zhang F H 2015 Sci. China: Phys. Mech. Astron. 58 7

    [6]

    Ambainis A, Bach E, Nayak A, Vishwanath A, Watrous J 2001 Proceedings of the 33th ACM Symposium on Theory of Computing Heraklion, Greece, July 6-8, 2001 p37

    [7]

    Aharonov D, Ambainis A, Kempe J, Vazirani U 2001 Proceedings of the 33th ACM Symposium on Theory of Computing Heraklion, Greece, July 6-8, 2001 p50

    [8]

    Childs A M, Farhi E, Gutmann S 2002 Quantum Inf. Process. 1 35

    [9]

    Hillery M, Bergou J, Feldman E 2003 Phys. Rev. A 68 032314

    [10]

    Ambainis A, Kempe J, Rivosh A 2005 Proceedings of the 16th Annual ACM-SIAM Symposium on Discrete Algorithms Philadelphia, USA, January 23-25, 2005 p1099

    [11]

    Shenvi N, Kempe J, Whaley K B 2003 Phys. Rev. A 67 052307

    [12]

    Potoček V, Gábris A, Kiss T, Jex I 2009 Phys. Rev. A 79 012325

    [13]

    Reitzner D, Hillery M, Feldman E, Buzek V 2009 Phys. Rev. A 79 012323

    [14]

    Liu Y M, Chen H W, Liu Z H, Xue X L, Zhu W N 2015 Acta Phys. Sin. 64 010301 (in Chinese) [刘艳梅, 陈汉武, 刘志昊, 薛希玲, 朱皖宁 2015 物理学报 64 010301]

    [15]

    Kempe J 2005 Probability Theory and Related Fields 133 215

    [16]

    Wang H, Ma Z, Ma C G 2013 Chin. Sci. Bull. 58 28

    [17]

    Travaglione B C, Milburn G J 2002 Phys. Rev. A 65 3

    [18]

    WANG C, LI Y S, HAO L 2011 Chin. Sci. Bull. 56 20

    [19]

    Xue P, Zhang R, Qin H, Zhan X, Bian Z H, Li J, Sanders B C 2015 Phys. Rev. Lett. 114 140502

    [20]

    Ambainis A 2007 SIAM J. Comput. 37 210

    [21]

    Childs A M, Eisenberg J M 2005 Quantum Inf. Comput. 5 593

    [22]

    Childs A M, Farhi E, Gutmann S 2002 Quantum Inf. Process. 1 35

    [23]

    Long G L, Liu Y 2007 Front. Comput. Sci. 1 3

    [24]

    Nielsen M A, Chuang I L 2000 Quantum Computation and Quantum Information (Cambridge: Cambridge University Press)

    [25]

    Fredkin E, Toffoli T 1982 Int. J. Theor. Phys. 21 219

    [26]

    Toffoli T 1981 Math. Syst. Theory 14 13

    [27]

    Grover L K 1998 Phys. Rev. Lett. 80 4329

    [28]

    Long G L, Li Y S, Zhang W L, Niu L 1999 Phys. Lett. A 262 27

    [29]

    Younes A 2007 Appl. Math. Informat. 7 93

    [30]

    Li P C, Li S Y 2007 Phys. Lett. A 366 42

    [31]

    Long G L, Li X, Sun Y 2002 Phys. Lett. A 294 3

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出版历程
  • 收稿日期:  2015-04-22
  • 修回日期:  2015-09-07
  • 刊出日期:  2015-12-05

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