Floquet Hamiltonian engineering of an isolated many-body spin system
Floquet Hamiltonian engineering of an isolated many-body spin system
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DOI：
10.1126/science.abd9547
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发表时间：
2021-11-26
期刊：
影响因子：
56.9
通讯作者：
Weidemuller, Matthias
中科院分区：
文献类型：
--
作者：
Geier, Sebastian;Thaicharoen, Nithiwadee;Weidemuller, Matthias
控制相互作用是多体系统量子工程的关键。利用时间周期驱动，一个自然给定的闭合量子系统的多体哈密顿量可以转化为一个有效的目标哈密顿量，它表现出截然不同的动力学特性。我们用Rydberg态所代表的超冷原子气体中的自旋系统演示了这种Floquet工程。通过应用一系列的自旋操作，我们改变了有效的海森堡XYZ哈密顿量的对称性。因此，总自旋的松弛行为被极大地改变。观测到的动力学可以通过半经典模拟定性地捕捉到。设计广泛的哈密顿学派为在单一的实验环境中实现非平衡动力学的量子模拟打开了巨大的机会。
Controlling interactions is the key element for the quantum engineering of many-body systems. Using time-periodic driving, a naturally given many-body Hamiltonian of a closed quantum system can be transformed into an effective target Hamiltonian that exhibits vastly different dynamics. We demonstrate such Floquet engineering with a system of spins represented by Rydberg states in an ultracold atomic gas. By applying a sequence of spin manipulations, we change the symmetry properties of the effective Heisenberg XYZ Hamiltonian. As a consequence, the relaxation behavior of the total spin is drastically modified. The observed dynamics can be qualitatively captured by a semiclassical simulation. Engineering a wide range of Hamiltonians opens vast opportunities for implementing quantum simulation of nonequilibrium dynamics in a single experimental setting.