Abstract
The quantum router is a key part of a quantum network. How to design a fully quantum router is a dominant theme in the area of quantum communication. Based on the cross-phase modulation technique, we propose a scheme to realize an optical quantum router using the c-path operation for its basic operation. This router is a perfect, fully quantum router, and it is available for arbitrary (separated or entangled) input signals and covers all possible control modes (the general n-control-m mode). Moreover, this router protects target signals and preserves quantum features, such as coherent superposition and entanglement. This is a new and powerful feature when compared with classical routers. With the development of current experimental technology, our scheme is feasible.
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