›› 2014, Vol. 23 ›› Issue (12): 120309-120309.doi: 10.1088/1674-1056/23/12/120309

• GENERAL • 上一篇    下一篇

Block-free optical quantum Banyan network based on quantum state fusion and fission

朱畅华, 孟艳红, 权东晓, 赵楠, 裴昌幸   

  1. State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China
  • 收稿日期:2014-06-05 修回日期:2014-08-02 出版日期:2014-12-15 发布日期:2014-12-15
  • 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), the Fundamental Research Funds for the Central Universities (Grant No. K5051201021), and the Scholarship from China Scholarship Council (Grant No. 201308615037).

Block-free optical quantum Banyan network based on quantum state fusion and fission

Zhu Chang-Hua (朱畅华), Meng Yan-Hong (孟艳红), Quan Dong-Xiao (权东晓), Zhao Nan (赵楠), Pei Chang-Xing (裴昌幸)   

  1. State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China
  • Received:2014-06-05 Revised:2014-08-02 Online:2014-12-15 Published:2014-12-15
  • 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), the Fundamental Research Funds for the Central Universities (Grant No. K5051201021), and the Scholarship from China Scholarship Council (Grant No. 201308615037).

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摘要： Optical switch fabric plays an important role in building multiple-user optical quantum communication networks. Owing to its self-routing property and low complexity, a banyan network is widely used for building switch fabric. While, there is no efficient way to remove internal blocking in a banyan network in a classical way, quantum state fusion, by which the two-dimensional internal quantum states of two photons could be combined into a four-dimensional internal state of a single photon, makes it possible to solve this problem. In this paper, we convert the output mode of quantum state fusion from spatial-polarization mode into time-polarization mode. By combining modified quantum state fusion and quantum state fission with quantum Fredkin gate, we propose a practical scheme to build an optical quantum switch unit which is block free. The scheme can be extended to building more complex units, four of which are shown in this paper.

关键词: optical switch fabric, quantum state fusion, quantum Fredkin gate, linear optics

Abstract: Optical switch fabric plays an important role in building multiple-user optical quantum communication networks. Owing to its self-routing property and low complexity, a banyan network is widely used for building switch fabric. While, there is no efficient way to remove internal blocking in a banyan network in a classical way, quantum state fusion, by which the two-dimensional internal quantum states of two photons could be combined into a four-dimensional internal state of a single photon, makes it possible to solve this problem. In this paper, we convert the output mode of quantum state fusion from spatial-polarization mode into time-polarization mode. By combining modified quantum state fusion and quantum state fission with quantum Fredkin gate, we propose a practical scheme to build an optical quantum switch unit which is block free. The scheme can be extended to building more complex units, four of which are shown in this paper.

Key words: optical switch fabric, quantum state fusion, quantum Fredkin gate, linear optics

中图分类号:  (Quantum communication)

  • 03.67.Hk
42.50.Ex (Optical implementations of quantum information processing and transfer)