Quantum walks on a programmable two-dimensional 62-qubit superconducting processor

Ming Gong; Shiyu Wang; Chen Zha; Ming-Cheng Chen; He-Liang Huang; Yulin Wu; Qingling Zhu; Youwei Zhao; Shaowei Li; Shaojun Guo; Haoran Qian; Yangsen Ye; Fusheng Chen; Chong Ying; Jiale Yu; Daojin Fan; Dachao Wu; Hong Su; Hui Deng; Hao Rong; Kaili Zhang; Sirui Cao; Jin Lin; Yu Xu; Lihua Sun; Cheng Guo; Na Li; Futian Liang; V M Bastidas; Kae Nemoto; W J Munro; Yong-Heng Huo; Chao-Yang Lu; Cheng-Zhi Peng; Xiaobo Zhu; Jian-Wei Pan

doi:10.1126/science.abg7812

Quantum walks on a programmable two-dimensional 62-qubit superconducting processor

Science. 2021 May 28;372(6545):948-952. doi: 10.1126/science.abg7812. Epub 2021 May 6.

Authors

Ming Gong^#^{1

2

3}, Shiyu Wang^#^{1

2

3}, Chen Zha^#^{1

2

3}, Ming-Cheng Chen^{1

2

3}, He-Liang Huang^{1

2

3}, Yulin Wu^{1

2

3}, Qingling Zhu^{1

2

3}, Youwei Zhao^{1

2

3}, Shaowei Li^{1

2

3}, Shaojun Guo^{1

2

3}, Haoran Qian^{1

2

3}, Yangsen Ye^{1

2

3}, Fusheng Chen^{1

2

3}, Chong Ying^{1

2

3}, Jiale Yu^{1

2

3}, Daojin Fan^{1

2

3}, Dachao Wu^{1

2

3}, Hong Su^{1

2

3}, Hui Deng^{1

2

3}, Hao Rong^{1

2

3}, Kaili Zhang^{1

2

3}, Sirui Cao^{1

2

3}, Jin Lin^{1

2

3}, Yu Xu^{1

2

3}, Lihua Sun^{1

2

3}, Cheng Guo^{1

2

3}, Na Li^{1

2

3}, Futian Liang^{1

2

3}, V M Bastidas⁴, Kae Nemoto⁵, W J Munro^{4

5}, Yong-Heng Huo^{1

2

3}, Chao-Yang Lu^{1

2

3}, Cheng-Zhi Peng^{1

2

3}, Xiaobo Zhu^{6

2

3}, Jian-Wei Pan^{6

2

3}

Affiliations

¹ Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China.
² Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.
³ Shanghai Research Center for Quantum Sciences, Shanghai 201315, China.
⁴ NTT Basic Research Laboratories and Research Center for Theoretical Quantum Physics, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
⁵ National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan.
⁶ Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China. [email protected] [email protected].

^# Contributed equally.

PMID: 33958483
DOI: 10.1126/science.abg7812

Abstract

Quantum walks are the quantum mechanical analog of classical random walks and an extremely powerful tool in quantum simulations, quantum search algorithms, and even for universal quantum computing. In our work, we have designed and fabricated an 8-by-8 two-dimensional square superconducting qubit array composed of 62 functional qubits. We used this device to demonstrate high-fidelity single- and two-particle quantum walks. Furthermore, with the high programmability of the quantum processor, we implemented a Mach-Zehnder interferometer where the quantum walker coherently traverses in two paths before interfering and exiting. By tuning the disorders on the evolution paths, we observed interference fringes with single and double walkers. Our work is a milestone in the field, bringing future larger-scale quantum applications closer to realization for noisy intermediate-scale quantum processors.

Publication types

Research Support, Non-U.S. Gov't