Fast qubit initialization in a superconducting circuit  

作　　者：Tianqi Huang Wen Zheng Shuqing Song Yuqian Dong Xiaopei Yang Zhikun Han Dong Lan Xinsheng Tan 黄天棋;郑文;宋树清;董煜倩;杨晓沛;韩志坤;兰栋;谭新生(National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,China)

机构地区：[1]National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Physics B》2021年第7期55-58,共4页中国物理B（英文版）

基　　金：the National Key R&D Program of China(Grant No.2016YFA0301802);the National Natural Science Foundation of China(Grant Nos.61521001,11474153,and 11890704);the Key R/D Program of Guangdong Province,China(Grant No.2018B030326001)。

摘　　要：We demonstrate an active reset protocol in a superconducting quantum circuit.The thermal population on the excited state of a transmon qubit is reduced through driving the transitions between the qubit and an ancillary qubit.Furthermore,we investigate the efficiency of this approach at different temperatures.The result shows that population in the first excited state can be dropped from 7%to 2.55%in 27 ns at 30 m K.The efficiency improves as the temperature increases.Compared to other schemes,our proposal alleviates the requirements for measurement procedure and equipment.With the increase of qubit integration,the fast reset technique holds the promise of improving the fidelity of quantum control.

关 键 词：active reset quantum cooling thermal population 

分 类 号：TM13[电气工程—电工理论与新技术] O413[理学—理论物理]