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

作     者：Yan Li Shu-Xiao Li Hai-Ou Li Guang-Wei Deng Gang Cao Ming Xiao Guo-Ping Guo 李炎;李舒啸;李海欧;邓光伟;曹刚;肖明;郭国平

作者机构：CAS Key Laboratory of Quantum InformationUniversity of Science and Technology of ChinaHefei 230026China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2018年第27卷第7期

页      面：152-157页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：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) the Anhui Initiative in Quantum information Technologies,China(Grant No.AHY080000) 

主　　题：quantum dot microwave resonator charge noise graphene 

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.