Quantum simulation of the wavefunction to probe frustrated Heisenberg spin systems
Quantum simulation of the wavefunction to probe frustrated Heisenberg spin systems
复制标题
DOI：
10.1038/nphys1919
复制
发表时间：
2011-05-01
期刊：
影响因子：
19.6
通讯作者：
Walther, Philip
中科院分区：
文献类型：
--
作者：
Ma, Xiao-song;Dakic, Borivoje;Walther, Philip
量子模拟器是可控的量子系统，可以在经典计算机无法处理的情况下再现感兴趣系统的动力学。量子技术的最新发展使研究复杂量子系统所需的单个量子粒子的精确控制成为可能。特别是，能够模拟受挫海森堡自旋系统的量子模拟器为理解高温超导体等奇异物质提供了平台。在这里，我们报告的模拟量子模拟的基态波函数探测任意海森堡型相互作用之间的四个自旋1/2粒子。根据相互作用强度，系统内的挫折出现，使基态从本地化的共振价键状态的演变。这种自旋为1/2的四聚体是利用四个光子的偏振态产生的。单粒子的可寻址性和可调测量诱导的相互作用为我们提供了对单个粒子之间纠缠动力学的见解。我们直接提取基态能量和两两量子关联来观察纠缠的一夫一妻制。
Quantum simulators are controllable quantum systems that can reproduce the dynamics of the system of interest in situations that are not amenable to classical computers. Recent developments in quantum technology enable the precise control of individual quantum particles as required for studying complex quantum systems. In particular, quantum simulators capable of simulating frustrated Heisenberg spin systems provide platforms for understanding exotic matter such as high-temperature superconductors. Here we report the analogue quantum simulation of the ground-state wavefunction to probe arbitrary Heisenberg-type interactions among four spin-1/2 particles. Depending on the interaction strength, frustration within the system emerges such that the ground state evolves from a localized to a resonating-valence-bond state. This spin-1/2 tetramer is created using the polarization states of four photons. The single-particle addressability and tunable measurement-induced interactions provide us with insights into entanglement dynamics among individual particles. We directly extract ground-state energies and pairwise quantum correlations to observe the monogamy of entanglement.