Floquet prethermal phase protected by U(1) symmetry on a superconducting quantum processor
Chong Ying, Qihao Guo, Shaowei Li, Ming Gong, Xiu–Hao Deng, Fusheng Chen, Chen Zha, Yangsen Ye, Can Wang, Qingling Zhu, Shiyu Wang, Youwei Zhao, Haoran Qian, Shaojun Guo, Yulin Wu, Hao Rong, Huiqiu Deng, Futian Liang, Jin Lin, Yu Xu, Cheng-Zhi Peng, Chao‐Yang Lu, Zhang‐qi Yin, Xiaobo Zhu, Jian-Wei Pan
Abstract
Periodically driven systems, or Floquet systems, exhibit many novel dynamics and interesting out-of-equilibrium phases of matter. Those phases arising with the quantum systems' symmetries, such as global U(1) symmetry, can even show dynamical stability with symmetry protection. Here we experimentally demonstrate a U(1) symmetry-protected prethermal phase, via performing a digital-analog quantum simulation on a superconducting quantum processor. The dynamical stability of this phase is revealed by its robustness against external perturbations. We also find that the site-averaged square of the two-spin correlation function in this phase is stabilized by the interaction between the spins. Our work reveals a promising prospect in discovering emergent quantum dynamical phases with digital-analog quantum simulators.