Science ( IF 56.9 ) Pub Date : 2021-03-26 , DOI: 10.1126/science.abg2530 D. Bluvstein 1 , A. Omran 1, 2 , H. Levine 1 , A. Keesling 1 , G. Semeghini 1 , S. Ebadi 1 , T. T. Wang 1 , A. A. Michailidis 3 , N. Maskara 1 , W. W. Ho 1, 4 , S. Choi 5 , M. Serbyn 3 , M. Greiner 1 , V. Vuletić 6 , M. D. Lukin 1
The control of nonequilibrium quantum dynamics in many-body systems is challenging because interactions typically lead to thermalization and a chaotic spreading throughout Hilbert space. We investigate nonequilibrium dynamics after rapid quenches in a many-body system composed of 3 to 200 strongly interacting qubits in one and two spatial dimensions. Using a programmable quantum simulator based on Rydberg atom arrays, we show that coherent revivals associated with so-called quantum many-body scars can be stabilized by periodic driving, which generates a robust subharmonic response akin to discrete time-crystalline order. We map Hilbert space dynamics, geometry dependence, phase diagrams, and system-size dependence of this emergent phenomenon, demonstrating new ways to steer complex dynamics in many-body systems and enabling potential applications in quantum information science.
中文翻译:
控制被驱动的Rydberg原子阵列中的量子多体动力学
多体系统中非平衡量子动力学的控制具有挑战性,因为相互作用通常会导致热化和整个希尔伯特空间的混沌扩散。我们研究了由一到两个空间维度中的3到200个强烈相互作用的量子位组成的多体系统快速淬灭后的非平衡动力学。使用基于Rydberg原子阵列的可编程量子仿真器,我们证明了与所谓的量子多体疤痕相关的相干复兴可以通过周期性驱动来稳定,这会产生类似于离散时间晶序的鲁棒次谐波响应。我们绘制了这种新兴现象的希尔伯特空间动力学,几何形状相关性,相图和系统大小相关性,