›› 2015, Vol. 24 ›› Issue (4): 44204-044204.doi: 10.1088/1674-1056/24/4/044204

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Phase-controlled coherent population trapping in superconducting quantum circuits

程广玲a, 王一平a, 陈爱喜a b   

  1. a Department of Applied Physics, East China Jiaotong University, Nanchang 330013, China;
    b Institute for Quantum Computing, University of Waterloo, Ontario N2L 3G1, Canada
  • 收稿日期:2014-09-16 修回日期:2014-10-16 出版日期:2015-04-05 发布日期:2015-04-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11165008 and 11365009), the Foundation of Young Scientist of Jiangxi Province, China (Grant No. 20142BCB23011), and the Scientific Research Foundation of Jiangxi Provincial Department of Education (Grant No. GJJ13348).

Phase-controlled coherent population trapping in superconducting quantum circuits

Cheng Guang-Ling (程广玲)a, Wang Yi-Ping (王一平)a, Chen Ai-Xi (陈爱喜)a b   

  1. a Department of Applied Physics, East China Jiaotong University, Nanchang 330013, China;
    b Institute for Quantum Computing, University of Waterloo, Ontario N2L 3G1, Canada
  • Received:2014-09-16 Revised:2014-10-16 Online:2015-04-05 Published:2015-04-05
  • Contact: Cheng Guang-Ling, Chen Ai-Xi E-mail:glingcheng@ecjtu.edu.cn;aixichen@ecjtu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11165008 and 11365009), the Foundation of Young Scientist of Jiangxi Province, China (Grant No. 20142BCB23011), and the Scientific Research Foundation of Jiangxi Provincial Department of Education (Grant No. GJJ13348).

摘要: We investigate the influences of the-applied-field phases and amplitudes on the coherent population trapping behavior in superconducting quantum circuits. Based on the interactions of the microwave fields with a single Δ-type three-level fluxonium qubit, the coherent population trapping could be obtainable and it is very sensitive to the relative phase and amplitudes of the applied fields. When the relative phase is tuned to 0 or π, the maximal atomic coherence is present and coherent population trapping occurs. While for the choice of π/2, the atomic coherence becomes weak. Meanwhile, for the fixed relative phase π/2, the value of coherence would decrease with the increase of Rabi frequency of the external field coupled with two lower levels. The responsible physical mechanism is quantum interference induced by the control fields, which is indicated in the dressed-state representation. The microwave coherent phenomenon is present in our scheme, which will have potential applications in optical communication and nonlinear optics in solid-state devices.

关键词: coherent population trapping, phase control, superconducting quantum circuits

Abstract: We investigate the influences of the-applied-field phases and amplitudes on the coherent population trapping behavior in superconducting quantum circuits. Based on the interactions of the microwave fields with a single Δ-type three-level fluxonium qubit, the coherent population trapping could be obtainable and it is very sensitive to the relative phase and amplitudes of the applied fields. When the relative phase is tuned to 0 or π, the maximal atomic coherence is present and coherent population trapping occurs. While for the choice of π/2, the atomic coherence becomes weak. Meanwhile, for the fixed relative phase π/2, the value of coherence would decrease with the increase of Rabi frequency of the external field coupled with two lower levels. The responsible physical mechanism is quantum interference induced by the control fields, which is indicated in the dressed-state representation. The microwave coherent phenomenon is present in our scheme, which will have potential applications in optical communication and nonlinear optics in solid-state devices.

Key words: coherent population trapping, phase control, superconducting quantum circuits

中图分类号:  (Quantum optics)

  • 42.50.-p
78.40.-q (Absorption and reflection spectra: visible and ultraviolet) 85.25.Hv (Superconducting logic elements and memory devices; microelectronic circuits)