Quantum information-holding single-photon router based on spontaneous emission |
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| Authors: | GuoAn Yan HaoXue Qiao Hua Lu AiXi Chen |
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| Affiliation: | 1.School of Physics and Technology,Wuhan University,Wuhan,China;2.State Key Laboratory of Magnetic Resonances and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan,China;3.School of Science,Hubei University of Technology,Wuhan,China;4.Key Laboratory of Quantum Information, Chinese Academy of Sciences,University of Science and Technology of China,Hefei,China;5.Department of Applied Physics,Zhejiang Sci-Tech University,Hangzhou,China;6.Institute for Quantum Computing,University of Waterloo,Waterloo,Canada |
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| Abstract: | In this paper, we propose a single-photon router via the use of a four-level atom system coupled with two one-dimensional coupled-resonator waveguides. A single photon can be directed from one quantum channel into another by atomic spontaneous emission. The coherent resonance and the photonic bound states lead to the perfect reflection appearing in the incident channel. The fidelity of the atom is related to the magnitude of the coupling strength and can reach unit when the coupling strength matches g a = g b . This shows that the transfer of a single photon into another quantum channel has no influence on the fidelity at special points. |
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