Rapid and unconditional parametric reset protocol for tunable superconducting qubits

Yu Zhou, Zhenxing Zhang, Zelong Yin, Sainan Huai, Xiu Gu, Xiong Xu, Jonathan Allcock, Fuming Liu, Guanglei Xi, Qiaonian Yu, Hualiang Zhang, Mengyu Zhang, Hekang Li, Xiaohui Song, Zhan Wang, Dongning Zheng, Shuoming An (), Yarui Zheng and Shengyu Zhang
Additional contact information
Yu Zhou: Tencent
Zhenxing Zhang: Tencent
Zelong Yin: Tencent
Sainan Huai: Tencent
Xiu Gu: Tencent
Xiong Xu: Tencent
Jonathan Allcock: Tencent
Fuming Liu: Tencent
Guanglei Xi: Tencent
Qiaonian Yu: Tencent
Hualiang Zhang: Tencent
Mengyu Zhang: Tencent
Hekang Li: Chinese Academy of Sciences
Xiaohui Song: Chinese Academy of Sciences
Zhan Wang: Chinese Academy of Sciences
Dongning Zheng: Chinese Academy of Sciences
Shuoming An: Tencent
Yarui Zheng: Tencent
Shengyu Zhang: Tencent

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Qubit initialization is a critical task in quantum computation and communication. Extensive efforts have been made to achieve this with high speed, efficiency and scalability. However, previous approaches have either been measurement-based and required fast feedback, suffered from crosstalk or required sophisticated calibration. Here, we report a fast and high-fidelity reset scheme, avoiding the issues above without any additional chip architecture. By modulating the flux through a transmon qubit, we realize a swap between the qubit and its readout resonator that suppresses the excited state population to 0.08% ± 0.08% within 34 ns (284 ns if photon depletion of the resonator is required). Furthermore, our approach (i) can achieve effective second excited state depletion, (ii) has negligible effects on neighboring qubits, and (iii) offers a way to entangle the qubit with an itinerant single photon, useful in quantum communication applications.

Date: 2021
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DOI: 10.1038/s41467-021-26205-y

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