エンタングルメント検出とトポロジー状態のキャラクタリゼーション

2021 年度 実績報告書

• 研究課題/領域番号: 19F19326
• 研究機関: 国立研究開発法人理化学研究所
• 研究代表者: NORI FRANCO 国立研究開発法人理化学研究所, 開拓研究本部, 主任研究員 (50415262)
• 研究分担者: ZHANG YU-RAN 国立研究開発法人理化学研究所, .開拓研究本部, 外国人特別研究員
• 研究期間 (年度): 2019-11-08 – 2022-03-31
• キーワード: multipartite / entanglement / quantum simulation / superconducting qubits

研究実績の概要

We studied several emergent phenomena in quantum many-body systems from the perspective of quantum information. We theoretically studied topological phases in perturbed toric codes using quantum Fisher information (QFI). We showed thermalization and disorder-assisted stabilization of topological order after a quantum quench. We studied the 2D toric code at finite temperatures and showed that topological order cannot survive. Using a 19-qubit superconducting (SC) circuit, we generated and characterized multi-qubit entangled states. With 10 qubits, we measured the nonlinear squeezing parameter that had never been measured before. With all 19 qubits, we observed a metrological gain of 9.89 dB over the standard quantum limit, indicating a high level of entanglement for quantum-enhanced estimation sensitivity. We employed a 1D 12-qubit SC circuit to identify regimes of strong and weak thermalization with different states. Using a ladder-type SC circuit, we simulated both the XX-ladder and XX-chain models. We signaled thermalization and information scrambling in the XX ladder, which are absent in the XX chain. We realized a deterministic one-way C-not gate and one-way X rotations on IBM’s quantum-computing platform. We used multipartite entanglement to detect dynamical phase transitions using 16 SC qubits. We demonstrated the engineering of multiple dissipative channels by controlling adjacent nuclear spins of a NV center and observed the QFI’s flows to and from the environment.

現在までの達成度 (段落)

令和3年度が最終年度であるため、記入しない。

今後の研究の推進方策

令和3年度が最終年度であるため、記入しない。

研究成果

• [雑誌論文] Multipartite entanglement of the topologically ordered state in a perturbed toric code (2022)
  • 著者名/発表者名: Yu-Ran Zhang, Yu Zeng, Tao Liu, Heng Fan, J. Q. You, Franco Nori
  • 雑誌名: Physical Review Research (2022) 巻: 03315 V1 ページ: 1-10
  • DOI: 10.48550/arXiv.2109.03315
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Observation of thermalization and information scrambling in a superconducting quantum processor (2022)
  • 著者名/発表者名: Qingling Zhu, Zheng-Hang Sun, Ming Gong, Fusheng Chen, Yu-Ran Zhang, Yulin Wu, Yangsen Ye, Chen Zha, Shaowei Li, Shaojun Guo, Haoran Qian, He-Liang Huang, Jiale Yu, Hui Deng, Hao Rong, Jin Lin, Yu Xu, Lihua Sun, Cheng Guo, Na Li, Futian Liang, Cheng-Zhi Peng, Heng Fan, Xiaobo Zhu, and Jian-Wei Pan
  • 雑誌名: Physical Review Letters 巻: 128 ページ: 1-6
  • DOI: 10.1103/PhysRevLett.128.160502
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Metrological characterization of non-Gaussian entangled states of superconducting qubits (2022)
  • 著者名/発表者名: Kai Xu, Yu-Ran Zhang, Zheng-Hang Sun, Hekang Li, Pengtao Song, Zhongcheng Xiang, Kaixuan Huang, Hao Li, Yun-Hao Shi, Chi-Tong Chen, Xiaohui Song, Dongning Zheng, Franco Nori, H. Wang, Heng Fan
  • 雑誌名: Physical Review Letters 巻: 128 ページ: 1-8
  • DOI: 10.1103/PhysRevLett.128.150501
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Deterministic one-way logic gates on a cloud quantum computer (2022)
  • 著者名/発表者名: Zhi-Peng Yang, Alakesh Baishya, Huan-Yu Ku, Yu-Ran Zhang, Anton Frisk Kockum, Yueh-Nan Chen, Fu-Li Li, Jaw-Shen Tsai, Franco Nori
  • 雑誌名: Physical Review A 巻: 105 ページ: 1-12
  • DOI: 10.1103/PhysRevA.105.042610
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Discrete time crystal in a driven-dissipative Bose-Hubbard model with two-photon processes (2022)
  • 著者名/発表者名: Tong Liu, Yu-Ran Zhang, Kai Xu, Jian Cui, and Heng Fan
  • 雑誌名: Physical Review A 巻: 105, 013710 ページ: 1-10
  • DOI: 10.1103/PhysRevA.105.013710
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Observation of Strong and Weak Thermalization in a Superconducting Quantum Processor (2021)
  • 著者名/発表者名: Fusheng Chen, Zheng-Hang Sun, Ming Gong, Qingling Zhu, Yu-Ran Zhang, Yulin Wu, Yangsen Ye, Chen Zha, Shaowei Li, Shaojun Guo, Haoran Qian, He-Liang Huang, Jiale Yu, Hui Deng, Hao Rong, Jin Lin, Yu Xu, Lihua Sun, Cheng Guo, Na Li, Futian Liang, Cheng-Zhi Peng, Heng Fan, Xiaobo Zhu, and Jian-Wei Pan
  • 雑誌名: Physical Review Letters 巻: 127 ページ: 1-6
  • DOI: 10.1103/PhysRevLett.127.020602
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Observation of Bloch oscillations and Wannier-Stark localization on a superconducting processor (2021)
  • 著者名/発表者名: Xue-Yi Guo, Zi-Yong Ge, Hekang Li, Zhan Wang, Yu-Ran Zhang, Peangtao Song, Zhongcheng Xiang, Xiaohui Song, Yirong Jin, Kai Xu, Dongning Zheng, and Heng Fan
  • 雑誌名: npj Quantum Information 巻: 7, Article number: 51 ページ: 1-6
  • DOI: 10.1038/s41534-021-00385-3
  • 査読あり / オープンアクセス / 国際共著
• [学会発表] Observing nonlinear spin squeezing and entanglement of non-Gaussian states with interconnected superconducting qubits (2021)
  • 著者名/発表者名: Yu-Ran Zhang
  • 学会等名: APS March Meeting 2021
  • 国際学会