中国物理B ›› 2018, Vol. 27 ›› Issue (7): 76105-076105.doi: 10.1088/1674-1056/27/7/076105

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Charge noise acting on graphene double quantum dots in circuit quantum electrodynamics architecture

Yan Li(李炎), Shu-Xiao Li(李舒啸), Hai-Ou Li(李海欧)dag, Guang-Wei Deng(邓光伟), Gang Cao(曹刚), Ming Xiao(肖明), Guo-Ping Guo(郭国平)   

  1. CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2018-03-10 修回日期:2018-04-10 出版日期:2018-07-05 发布日期:2018-07-05
  • 通讯作者: Hai-Ou Li, Guo-Ping Guo E-mail:haiouli@ustc.edu.cn;gpguo@ustc.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0301700), the National Natural Science Foundation of China (Grant Nos. 61674132, 11674300, 11575172, and 11625419), and the Anhui Initiative in Quantum information Technologies, China (Grant No. AHY080000). This work was partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication.

Charge noise acting on graphene double quantum dots in circuit quantum electrodynamics architecture

Yan Li(李炎), Shu-Xiao Li(李舒啸), Hai-Ou Li(李海欧)dag, Guang-Wei Deng(邓光伟), Gang Cao(曹刚), Ming Xiao(肖明), Guo-Ping Guo(郭国平)   

  1. CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • Received:2018-03-10 Revised:2018-04-10 Online:2018-07-05 Published:2018-07-05
  • Contact: Hai-Ou Li, Guo-Ping Guo E-mail:haiouli@ustc.edu.cn;gpguo@ustc.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0301700), the National Natural Science Foundation of China (Grant Nos. 61674132, 11674300, 11575172, and 11625419), and the Anhui Initiative in Quantum information Technologies, China (Grant No. AHY080000). This work was partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication.

摘要: We investigate the dephasing mechanisms induced by the charge noise and microwave heating effect acting on a graphene double quantum dot (DQD) capacitively coupled to a microwave resonator. The charge noise is obtained from DC transport current, and its contribution to dephasing is simultaneously determined by the amplitude response of the microwave resonator. A lowfrequency 1/f-type noise is demonstrated to be the dominant factor of the dephasing of graphene DQD. Furthermore, when the applied microwave power is larger than-90 dBm, the dephasing rate of graphene DQD increases rapidly with the increase of microwave power, and fluctuates slightly with the applied microwave power smaller than-90 dBm. Our results can be applied to suppress the impeditive influence on the dephasing of graphene-based devices associated with microwave input in the perspective investigations.

关键词: quantum dot, microwave resonator, charge noise, graphene

Abstract: We investigate the dephasing mechanisms induced by the charge noise and microwave heating effect acting on a graphene double quantum dot (DQD) capacitively coupled to a microwave resonator. The charge noise is obtained from DC transport current, and its contribution to dephasing is simultaneously determined by the amplitude response of the microwave resonator. A lowfrequency 1/f-type noise is demonstrated to be the dominant factor of the dephasing of graphene DQD. Furthermore, when the applied microwave power is larger than-90 dBm, the dephasing rate of graphene DQD increases rapidly with the increase of microwave power, and fluctuates slightly with the applied microwave power smaller than-90 dBm. Our results can be applied to suppress the impeditive influence on the dephasing of graphene-based devices associated with microwave input in the perspective investigations.

Key words: quantum dot, microwave resonator, charge noise, graphene

中图分类号:  (Structure of graphene)

  • 61.48.Gh
68.65.Hb (Quantum dots (patterned in quantum wells)) 03.67.Lx (Quantum computation architectures and implementations) 85.40.Qx (Microcircuit quality, noise, performance, and failure analysis)