Fast qubit initialization in a superconducting circuit

doi:10.1088/1674-1056/abff2b

中国物理B ›› 2021, Vol. 30 ›› Issue (7): 70310-070310.doi: 10.1088/1674-1056/abff2b

所属专题： SPECIAL TOPIC — Quantum computation and quantum simulation

Fast qubit initialization in a superconducting circuit

Tianqi Huang(黄天棋), Wen Zheng(郑文), Shuqing Song(宋树清), Yuqian Dong(董煜倩), Xiaopei Yang(杨晓沛), Zhikun Han(韩志坤), Dong Lan(兰栋), and Xinsheng Tan(谭新生)^†

National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China

收稿日期:2021-03-23 修回日期:2021-04-28 接受日期:2021-05-08 出版日期:2021-06-22 发布日期:2021-07-09
通讯作者: Xinsheng Tan E-mail:txs.nju@gmail.com
基金资助:
Project supported by the National Key R&D Program of China (Grant No. 2016YFA0301802), the National Natural Science Foundation of China (Grant Nos. 61521001, 11474153, and 11890704), and the Key R/D Program of Guangdong Province, China (Grant No. 2018B030326001).

Fast qubit initialization in a superconducting circuit

Tianqi Huang(黄天棋), Wen Zheng(郑文), Shuqing Song(宋树清), Yuqian Dong(董煜倩), Xiaopei Yang(杨晓沛), Zhikun Han(韩志坤), Dong Lan(兰栋), and Xinsheng Tan(谭新生)^†

National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China

Received:2021-03-23 Revised:2021-04-28 Accepted:2021-05-08 Online:2021-06-22 Published:2021-07-09
Contact: Xinsheng Tan E-mail:txs.nju@gmail.com
Supported by:
Project supported by the National Key R&D Program of China (Grant No. 2016YFA0301802), the National Natural Science Foundation of China (Grant Nos. 61521001, 11474153, and 11890704), and the Key R/D Program of Guangdong Province, China (Grant No. 2018B030326001).

摘要/Abstract

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 mK. 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

Abstract: 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 mK. 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.

Key words: active reset, quantum cooling, thermal population

中图分类号: (Quantum information)

03.67.-a

12.20.-m (Quantum electrodynamics) 85.25.-j (Superconducting devices)

Tianqi Huang(黄天棋), Wen Zheng(郑文), Shuqing Song(宋树清), Yuqian Dong(董煜倩), Xiaopei Yang(杨晓沛), Zhikun Han(韩志坤), Dong Lan(兰栋), and Xinsheng Tan(谭新生). Fast qubit initialization in a superconducting circuit[J]. 中国物理B, 2021, 30(7): 70310-070310.

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Fast qubit initialization in a superconducting circuit

Fast qubit initialization in a superconducting circuit

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