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Chin. Phys. B, 2020, Vol. 29(2): 020503    DOI: 10.1088/1674-1056/ab6654
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The effect of phase fluctuation and beam splitter fluctuation on two-photon quantum random walk

Zijing Zhang(张子静)1, Feng Wang(王峰)2, Jie Song(宋杰)1, Yuan Zhao(赵远)1
1 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 Tianjin Jinhang Institute of Physical Technique, Tianjin 300192, China
Abstract  In the optical quantum random walk system, phase fluctuation and beam splitter fluctuation are two unavoidable decoherence factors. These two factors degrade the performance of quantum random walk by destroying coherence, and even degrade it into a classical one. We propose a scheme for the simulation of quantum random walk using phase shifters, tunable beam splitters, and photodetectors. This proposed scheme enables us to analyze the effect of phase fluctuation and beam splitter fluctuation on two-photon quantum random walk. Furthermore, it is helpful to guide the control of phase fluctuation and beam splitter fluctuation in the experiment.
Keywords:  quantum random walk      decoherence      random walk  
Received:  10 October 2019      Revised:  28 November 2019      Accepted manuscript online: 
PACS:  05.40.Fb (Random walks and Levy flights)  
  05.40.-a (Fluctuation phenomena, random processes, noise, and Brownian motion)  
  03.65.Yz (Decoherence; open systems; quantum statistical methods)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61701139).
Corresponding Authors:  Zijing Zhang     E-mail:  zhangzijing@hit.edu.cn

Cite this article: 

Zijing Zhang(张子静), Feng Wang(王峰), Jie Song(宋杰), Yuan Zhao(赵远) The effect of phase fluctuation and beam splitter fluctuation on two-photon quantum random walk 2020 Chin. Phys. B 29 020503

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