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Cascaded Multi-Level Linear-Optical Quantum Router

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Abstract

Quantum router is the requisite element in the future quantum network. In this paper, we describe an approach for constructing the cascaded multi-level quantum router, which is based on the previous work of Lemr et al. (Phys. Rev. A 87, 062333 (2013)). We show that the signals in the router output ports of the ith level can be regarded as the input signals of the (i + 1)th level. In this way, the cascaded multi-level quantum router can be constructed. We can obtain a K level quantum router with 2K output ports. We also show that with the help of tunable c-phase gate, the success probability of the quantum router can be increased. Moreover, by exploiting the quantum nondemolition (QND) measurement, the control qubits can be reused to decrease the resource of the router. This protocol is useful for future quantum network.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China under Grant Nos. 11474168 and 61401222, the Qing Lan Project in Jiangsu Province, the open research fund of Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education (No. NYKL201303), and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, Nanjing, 210003, China

    Chang-Cheng Qu & Yu-Bo Sheng

  2. College of Mathematics and Physics, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Lan Zhou

  3. Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Yu-Bo Sheng

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  1. Chang-Cheng Qu
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  2. Lan Zhou
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Correspondence to Yu-Bo Sheng.

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Qu, CC., Zhou, L. & Sheng, YB. Cascaded Multi-Level Linear-Optical Quantum Router. Int J Theor Phys 54, 3004–3017 (2015). https://doi.org/10.1007/s10773-015-2539-9

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