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Chin. Phys. B, 2021, Vol. 30(7): 070310    DOI: 10.1088/1674-1056/abff2b
Special Issue: SPECIAL TOPIC — Quantum computation and quantum simulation
SPECIAL TOPIC—Quantum computation and quantum simulation Prev   Next  

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
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.
Keywords:  active reset      quantum cooling      thermal population  
Received:  23 March 2021      Revised:  28 April 2021      Accepted manuscript online:  08 May 2021
PACS:  03.67.-a (Quantum information)  
  12.20.-m (Quantum electrodynamics)  
  85.25.-j (Superconducting devices)  
Fund: 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).
Corresponding Authors:  Xinsheng Tan     E-mail:

Cite this article: 

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 2021 Chin. Phys. B 30 070310

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