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Probing dynamical phase transitions with a superconducting quantum simulator.
Xu, Kai; Sun, Zheng-Hang; Liu, Wuxin; Zhang, Yu-Ran; Li, Hekang; Dong, Hang; Ren, Wenhui; Zhang, Pengfei; Nori, Franco; Zheng, Dongning; Fan, Heng; Wang, H.
Afiliación
  • Xu K; Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  • Sun ZH; Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  • Liu W; Interdisciplinary Centre for Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China.
  • Zhang YR; Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan.
  • Li H; Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  • Dong H; Interdisciplinary Centre for Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China.
  • Ren W; Interdisciplinary Centre for Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China.
  • Zhang P; Interdisciplinary Centre for Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China.
  • Nori F; Interdisciplinary Centre for Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China.
  • Zheng D; Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan.
  • Fan H; Physics Department, University of Michigan, Ann Arbor, MI 48109-1040, USA.
  • Wang H; Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Sci Adv ; 6(25): eaba4935, 2020 Jun.
Article en En | MEDLINE | ID: mdl-32596458
Nonequilibrium quantum many-body systems, which are difficult to study via classical computation, have attracted wide interest. Quantum simulation can provide insights into these problems. Here, using a programmable quantum simulator with 16 all-to-all connected superconducting qubits, we investigate the dynamical phase transition in the Lipkin-Meshkov-Glick model with a quenched transverse field. Clear signatures of dynamical phase transitions, merging different concepts of dynamical criticality, are observed by measuring the nonequilibrium order parameter, nonlocal correlations, and the Loschmidt echo. Moreover, near the dynamical critical point, we obtain a spin squeezing of -7.0 ± 0.8 dB, showing multipartite entanglement, useful for measurements with precision fivefold beyond the standard quantum limit. On the basis of the capability of entangling qubits simultaneously and the accurate single-shot readout of multiqubit states, this superconducting quantum simulator can be used to study other problems in nonequilibrium quantum many-body systems, such as thermalization, many-body localization, and emergent phenomena in periodically driven systems.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2020 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2020 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos