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Optical switch fabric plays an important role in building multiple-useroptical quantum communication networks. Owing to its self-routing property andlow complexity, Banyan network is widely used for building switch fabric.While, there is no efficient way to remove internal blocking in Banyan networkby classical way. Quantum state fusion, by which the two-dimensional internalquantum state of two photons could be combined into four-dimensional internalstate of a single photon, makes it possible to solve this problem. In thispaper, we convert the output mode of quantum state fusion fromspatial-polarization mode to time-polarization mode. By combining modifiedquantum state fusion, quantum state fission with quantum Fredkin gate, wepropose a practical scheme to build an optical quantum switch unit which isblock free. The scheme can be extended to build more complex units, four ofwhich are shown in this paper.

Block Free Optical Quantum Banyan Network based on Quantum State Fusion and Fission