报告题目：Probing quantum phases in Rydberg ladder arrays
报告时间：2025年2月28日上午11：00
报告地点：物理楼329会议室
报告人：张进副教授
邀请人：邹海源研究员
报告人单位：重庆大学物理学院
报告人简介：Dr. Zhang is an Associate Professor and Master’s Supervisor at the School of Physics at Chongqing University. He received his Bachelor’s degree in Science from the University of Science and Technology of China in 2013 and completed his Ph.D. in Physics at the University of California, Riverside in 2019. From 2019 to 2022, Dr. Zhang worked as a postdoctoral researcher at the University of Massachusetts Amherst and the University of Iowa. His research primarily focuses on quantum simulation, quantum phase transitions, and quantum dynamics in strongly correlated many-body systems.
报告摘要：Rydberg atom arrays offer a highly programmable platform for quantum simulations, enabling the exploration of various quantum phases. Even in one dimension, the Rydberg chain supports a diverse set of quantum phases, including Zp symmetry-breaking phases, the gapless floating phase, and the associated conformal and non-conformal phase transitions. In this work, we extensively investigate quantum phases and phase transitions in two different ladder geometries with varying aspect ratios using density matrix renormalization group (DMRG) algorithms. We uncover additional types of symmetry-breaking and floating phases, providing strong numerical evidence for the existence of chiral transitions, Berezinskii-Kosterlitz-Thouless transitions, PT transitions, etc. Notably, we identify a broad regime of the floating phase in the incommensurate region between crystalline-ordered and disordered phases. While probing the floating phase in 1D Rydberg systems has been challenging due to its narrow phase-space existence, we show that a carefully chosen aspect ratio in the two-leg Rydberg ladder enables a significantly broader floating phase within experimentally accessible regimes. Furthermore, leveraging the neutral-atom quantum simulator developed by QuEra Computing Inc., we investigate quantum phases in ladder arrays comprising up to 92 qubits and experimentally observe the emergence of the quantum floating phase. Our findings motivate future studies on the nature of commensurate-incommensurate phase transitions and their non-equilibrium physics. Reference: J. Zhang et al. Nat. Commun. 16, 712 (2025).