中国物理B ›› 2020, Vol. 29 ›› Issue (7): 70301-070301.doi: 10.1088/1674-1056/ab90ee

• GENERAL • 上一篇    下一篇

Single-photon scattering controlled by an imperfect cavity

Liwei Duan(段立伟), Qing-Hu Chen(陈庆虎)   

  1. 1 Department of Physics and Zhejiang Province Key Laboratory of Quantum Technology and Device, Zhejiang University, Hangzhou 310027, China;
    2 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 收稿日期:2020-03-16 修回日期:2020-04-09 出版日期:2020-07-05 发布日期:2020-07-05
  • 通讯作者: Qing-Hu Chen E-mail:qhchen@zju.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11834005 and 11674285).

Single-photon scattering controlled by an imperfect cavity

Liwei Duan(段立伟)1, Qing-Hu Chen(陈庆虎)1,2   

  1. 1 Department of Physics and Zhejiang Province Key Laboratory of Quantum Technology and Device, Zhejiang University, Hangzhou 310027, China;
    2 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • Received:2020-03-16 Revised:2020-04-09 Online:2020-07-05 Published:2020-07-05
  • Contact: Qing-Hu Chen E-mail:qhchen@zju.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11834005 and 11674285).

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摘要： We study the single-photon transport in the coupled-resonator waveguide (CRW) controlled by an imperfect cavity. A Lorentzian spectrum is introduced to describe the dissipation. We find that the probability current conservation can be broken, although the imperfect cavity is a Hermitian system. The coupling strength between the imperfect cavity and the CRW has significant influences near the resonant frequency. With the increase of the coupling strength, the transmission coefficient becomes smaller. The spectral width plays a dominant role under the off-resonant condition, where the transmission coefficient is greatly suppressed with the increase of the spectral width. We also observe an abrupt jump of the transmission and reflection coefficients when the hopping amplitude is large enough. All the distinctive behaviors are closely related to the complex effective potential induced by the imperfect cavity.

关键词: single-photon scattering, coupled-resonator waveguide, imperfect cavity

Abstract: We study the single-photon transport in the coupled-resonator waveguide (CRW) controlled by an imperfect cavity. A Lorentzian spectrum is introduced to describe the dissipation. We find that the probability current conservation can be broken, although the imperfect cavity is a Hermitian system. The coupling strength between the imperfect cavity and the CRW has significant influences near the resonant frequency. With the increase of the coupling strength, the transmission coefficient becomes smaller. The spectral width plays a dominant role under the off-resonant condition, where the transmission coefficient is greatly suppressed with the increase of the spectral width. We also observe an abrupt jump of the transmission and reflection coefficients when the hopping amplitude is large enough. All the distinctive behaviors are closely related to the complex effective potential induced by the imperfect cavity.

Key words: single-photon scattering, coupled-resonator waveguide, imperfect cavity

中图分类号:  (Scattering theory)

  • 03.65.Nk
03.67.Lx (Quantum computation architectures and implementations) 42.50.-p (Quantum optics) 42.79.Gn (Optical waveguides and couplers)