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
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: SPECIAL TOPIC—Quantum computation and quantum simulation
• 页码范围: 62-66
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/abff2b

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.