中国物理B ›› 2018, Vol. 27 ›› Issue (8): 84202-084202.doi: 10.1088/1674-1056/27/8/084202

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

Cavity-induced ATS effect on a superconducting Xmon qubit

Xueyi Guo(郭学仪), Hui Deng(邓辉), Jianghao Ding(丁江浩), Hekang Li(李贺康), Pengtao Song(宋鹏涛), Zhan Wang(王战), Luhong Su(苏鹭红), Yanjun Liu(刘彦军), Zhongcheng Xiang(相忠诚), Jie Li(李洁), Yirong Jin(金贻荣), Yuxi Liu(刘玉玺), Dongning Zheng(郑东宁)   

  1. 1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Institute of Microelectronics, Tsinghua University, Beijing 100084, China;
    4 Tsinghua National Laboratory for Information Science and Technology(TNList), Beijing 100084, China
  • 收稿日期:2018-04-25 修回日期:2018-05-18 出版日期:2018-08-05 发布日期:2018-08-05
  • 通讯作者: Dongning Zheng E-mail:dzheng@iphy.ac.cn
  • 基金资助:

    Project supported by the Science Funds from the Ministry of Science and Technology of China (Grant Nos. 2014CB921401, 2017YFA0304300, 2014CB921202, and 2016YFA0300601), the National Natural Science Foundation of China (Grant No. 11674376), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07010300).

Cavity-induced ATS effect on a superconducting Xmon qubit

Xueyi Guo(郭学仪)1,2, Hui Deng(邓辉)1, Jianghao Ding(丁江浩)3, Hekang Li(李贺康)1,2, Pengtao Song(宋鹏涛)1,2, Zhan Wang(王战)1,2, Luhong Su(苏鹭红)1,2, Yanjun Liu(刘彦军)1, Zhongcheng Xiang(相忠诚)1, Jie Li(李洁)1, Yirong Jin(金贻荣)1, Yuxi Liu(刘玉玺)3,4, Dongning Zheng(郑东宁)1,2   

  1. 1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Institute of Microelectronics, Tsinghua University, Beijing 100084, China;
    4 Tsinghua National Laboratory for Information Science and Technology(TNList), Beijing 100084, China
  • Received:2018-04-25 Revised:2018-05-18 Online:2018-08-05 Published:2018-08-05
  • Contact: Dongning Zheng E-mail:dzheng@iphy.ac.cn
  • Supported by:

    Project supported by the Science Funds from the Ministry of Science and Technology of China (Grant Nos. 2014CB921401, 2017YFA0304300, 2014CB921202, and 2016YFA0300601), the National Natural Science Foundation of China (Grant No. 11674376), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07010300).

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摘要：

We couple a ladder-type three-level superconducting artificial atom to a cavity. Adjusting the artificial atom to make the cavity be resonant with the two upper levels, we then probe the lower two levels of the artificial atom. When driving the cavity to a coherent state, the probe spectrum shows energy level splitting induced by the quantized electromagnetic field in the cavity. This splitting size is related to the coupling strength between the cavity and the artificial atom and, thus, is fixed after the sample is fabricated. This is in contrast to the classical Autler-Townes splitting of a three-level system in which the splitting is proportional to the driving amplitude, which can be continuously changed. Our experiment results show the difference between the classical microwave driving field and the quantum field of the cavity.

关键词: superconducting qubit, circuit QED, Autler-Townes splitting

Abstract:

We couple a ladder-type three-level superconducting artificial atom to a cavity. Adjusting the artificial atom to make the cavity be resonant with the two upper levels, we then probe the lower two levels of the artificial atom. When driving the cavity to a coherent state, the probe spectrum shows energy level splitting induced by the quantized electromagnetic field in the cavity. This splitting size is related to the coupling strength between the cavity and the artificial atom and, thus, is fixed after the sample is fabricated. This is in contrast to the classical Autler-Townes splitting of a three-level system in which the splitting is proportional to the driving amplitude, which can be continuously changed. Our experiment results show the difference between the classical microwave driving field and the quantum field of the cavity.

Key words: superconducting qubit, circuit QED, Autler-Townes splitting

中图分类号:  (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

  • 42.50.Gy
85.25.Cp (Josephson devices)