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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) |
| State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China |
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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.
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Received: 05 June 2014
Revised: 02 August 2014
Accepted manuscript online:
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PACS:
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03.67.Hk
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(Quantum communication)
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42.50.Ex
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(Optical implementations of quantum information processing and transfer)
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| Fund: 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). |
Corresponding Authors:
Zhu Chang-Hua
E-mail: chhzhu@xidian.edu.cn
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Cite this article:
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) Block-free optical quantum Banyan network based on quantum state fusion and fission 2014 Chin. Phys. B 23 120309
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