Cite this Article
Li Yan, Li Shu-Xiao, Li Hai-Ou, Deng Guang-Wei, Cao Gang, Xiao Ming, Guo Guo-Ping. Charge noise acting on graphene double quantum dots in circuit quantum electrodynamics architecture. Chinese Physics B, 2018, 27(7): 076105  
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Charge noise acting on graphene double quantum dots in circuit quantum electrodynamics architecture
Li Yan, Li Shu-Xiao, Li Hai-Ou †, Deng Guang-Wei, Cao Gang, Xiao Ming, Guo Guo-Ping ‡
CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China

 

† Corresponding author. E-mail: haiouli@ustc.edu.cn gpguo@ustc.edu.cn

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.

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.

PACS: 61.48.Gh;68.65.Hb;03.67.Lx;85.40.Qx
Keyword:quantum dot;microwave resonator;charge noise;graphene
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