论文标题
利用障碍探测旋转和能量流体动力学
Exploiting disorder to probe spin and energy hydrodynamics
论文作者
论文摘要
在大规模量子平台中的一个突出挑战是同时实现强烈的互动，产生最有趣的行为，并可以探究它们。在相关阶段的背景下，本地解决方案使人们能够直接探测系统顺序的性质。同时，对于超平衡动力学，这种解决方案允许研究量子信息传播和操作员的增长。在这里，我们介绍了一种新颖的技术，该技术仅访问了全局控制，才能测量局部相关函数，直至单位分辨率。我们的方法利用了固态自旋集合中存在的内在障碍，以消除相关函数的非局部成分。利用此工具集，我们测量了核自旋链中的自旋和能量传输。通过通过Floquet Engineering调整相互作用的Hamiltonian，我们研究了弹道和扩散流体动力学之间的交叉。有趣的是，当系统既相互作用又（几乎是）集成时，我们会观察到与弹道能传输的扩散自旋传输的共存。
An outstanding challenge in large-scale quantum platforms is to simultaneously achieve strong interactions, giving rise to the most interesting behaviors, and local addressing -that can probe them. In the context of correlated phases, local addressing enables one to directly probe the nature of the system's order. Meanwhile, for out-ofequilibrium dynamics, such addressing allows the study of quantum information spreading and operator growth. Here, we introduce a novel technique that enables the measurement of local correlation functions, down to single-site resolution, despite access to only global controls. Our approach leverages the intrinsic disorder present in a solid-state spin ensemble to dephase the nonlocal components of the correlation function. Utilizing this toolset, we measure both the spin and energy transport in nuclear spin chains. By tuning the interaction Hamiltonian via Floquet engineering, we investigate the cross-over between ballistic and diffusive hydrodynamics. Interestingly, when the system is both interacting and (nearly-)integrable, we observe the coexistence of diffusive spin transport with ballistic energy transport.
