›› 2014, Vol. 23 ›› Issue (8): 84207-084207.doi: 10.1088/1674-1056/23/8/084207

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Heralded linear optical quantum Fredkin gate based on one auxiliary qubit and one single photon detector

朱畅华, 曹鑫, 权东晓, 裴昌幸   

  1. State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China
  • 收稿日期:2013-11-20 修回日期:2014-01-15 出版日期:2014-08-15 发布日期:2014-08-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61372076 and 61301171), the 111 Project (Grant No. B08038), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. K5051301059 and K5051201021).

Heralded linear optical quantum Fredkin gate based on one auxiliary qubit and one single photon detector

Zhu Chang-Hua (朱畅华), Cao Xin (曹鑫), Quan Dong-Xiao (权东晓), Pei Chang-Xing (裴昌幸)   

  1. State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China
  • Received:2013-11-20 Revised:2014-01-15 Online:2014-08-15 Published:2014-08-15
  • Contact: Zhu Chang-Hua E-mail:chhzhu@xidian.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61372076 and 61301171), the 111 Project (Grant No. B08038), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. K5051301059 and K5051201021).

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摘要： Linear optical quantum Fredkin gate can be applied to quantum computing and quantum multi-user communication networks. In the existing linear optical scheme, two single photon detectors (SPDs) are used to herald the success of the quantum Fredkin gate while they have no photon count. But analysis results show that for non-perfect SPD, the lower the detector efficiency, the higher the heralded success rate by this scheme is. We propose an improved linear optical quantum Fredkin gate by designing a new heralding scheme with an auxiliary qubit and only one SPD, in which the higher the detection efficiency of the heralding detector, the higher the success rate of the gate is. The new heralding scheme can also work efficiently under a non-ideal single photon source. Based on this quantum Fredkin gate, large-scale quantum switching networks can be built. As an example, a quantum Beneš network is shown in which only one SPD is used.

关键词: quantum Fredkin gate, linear optics, quantum switching network

Abstract: Linear optical quantum Fredkin gate can be applied to quantum computing and quantum multi-user communication networks. In the existing linear optical scheme, two single photon detectors (SPDs) are used to herald the success of the quantum Fredkin gate while they have no photon count. But analysis results show that for non-perfect SPD, the lower the detector efficiency, the higher the heralded success rate by this scheme is. We propose an improved linear optical quantum Fredkin gate by designing a new heralding scheme with an auxiliary qubit and only one SPD, in which the higher the detection efficiency of the heralding detector, the higher the success rate of the gate is. The new heralding scheme can also work efficiently under a non-ideal single photon source. Based on this quantum Fredkin gate, large-scale quantum switching networks can be built. As an example, a quantum Beneš network is shown in which only one SPD is used.

Key words: quantum Fredkin gate, linear optics, quantum switching network

中图分类号:  (Optical implementations of quantum information processing and transfer)

  • 42.50.Ex
03.67.Hk (Quantum communication)