Verification of a resetting protocol for an uncontrolled superconducting qubit

Ming Gong; Feihu Xu; Zheng-Da Li; Zizhu Wang; Yu-Zhe Zhang; Yulin Wu; Shaowei Li; Youwei Zhao; Shiyu Wang; Chen Zha; Hui Deng; Zhiguang Yan; Hao Rong; Futian Liang; Jin Lin; Yu Xu; Cheng Guo; Lihua Sun; Anthony D. Castellano; Cheng-Zhi Peng; Yu-Ao Chen; Xiaobo Zhu; Jian-Wei Pan

doi:10.1038/s41534-020-00329-3

npj Quantum Information (Dec 2020)

Verification of a resetting protocol for an uncontrolled superconducting qubit

Ming Gong,
Feihu Xu,
Zheng-Da Li,
Zizhu Wang,
Yu-Zhe Zhang,
Yulin Wu,
Shaowei Li,
Youwei Zhao,
Shiyu Wang,
Chen Zha,
Hui Deng,
Zhiguang Yan,
Hao Rong,
Futian Liang,
Jin Lin,
Yu Xu,
Cheng Guo,
Lihua Sun,
Anthony D. Castellano,
Cheng-Zhi Peng,
Yu-Ao Chen,
Xiaobo Zhu,
Jian-Wei Pan

Affiliations

Ming Gong: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Feihu Xu: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Zheng-Da Li: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Zizhu Wang: Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China
Yu-Zhe Zhang: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Yulin Wu: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Shaowei Li: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Youwei Zhao: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Shiyu Wang: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Chen Zha: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Hui Deng: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Zhiguang Yan: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Hao Rong: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Futian Liang: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Jin Lin: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Yu Xu: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Cheng Guo: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Lihua Sun: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Anthony D. Castellano: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Cheng-Zhi Peng: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Yu-Ao Chen: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Xiaobo Zhu: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China
Jian-Wei Pan: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China

DOI: https://doi.org/10.1038/s41534-020-00329-3
Journal volume & issue: Vol. 6, no. 1
pp. 1 – 9

Abstract

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Abstract Quantum resetting protocols allow a quantum system to be sent to a state in the past by making it interact with quantum probes when neither the free evolution of the system nor the interaction is controlled. We experimentally verify the simplest non-trivial case of a quantum resetting protocol, known as the $${{\mathcal{W}}}_{4}$$ W 4 protocol, with five superconducting qubits, testing it with different types of free evolutions and target–probe interactions. After projection, we obtained a reset state fidelity as high as 0.951, and the process fidelity was found to be 0.792. We also implemented 100 randomly chosen interactions and demonstrated an average success probability of 0.323 for $$\left|1\right\rangle$$ 1 and 0.292 for $$\left|-\right\rangle$$ − , and experimentally confirmed the nonzero probability of success for unknown interactions; the numerical simulated values are about 0.3. Our experiment shows that the simplest quantum resetting protocol can be implemented with current technologies, making such protocols a valuable tool in the eternal fight against unwanted evolution in quantum systems.

Published in npj Quantum Information

ISSN: 2056-6387 (Online)
Publisher: Nature Portfolio
Country of publisher: United Kingdom
LCC subjects: Science: Physics; Science: Mathematics: Instruments and machines: Electronic computers. Computer science
Website: https://www.nature.com/npjqi/

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