Institute for Quantum Computing, Department of Physics, University of Waterloo, Ontario, Canada.
Phys Rev Lett. 2011 Jul 1;107(1):010501. doi: 10.1103/PhysRevLett.107.010501. Epub 2011 Jun 30.
We employ a nuclear magnetic resonance (NMR) quantum information processor to simulate the ground state of an XXZ spin chain and measure its NMR analog of entanglement, or pseudoentanglement. The observed pseudoentanglement for a small-size system already displays a singularity, a signature which is qualitatively similar to that in the thermodynamical limit across quantum phase transitions, including an infinite-order critical point. The experimental results illustrate a successful approach to investigate quantum correlations in many-body systems using quantum simulators.
我们采用核磁共振（NMR）量子信息处理器来模拟 XXZ 自旋链的基态，并测量其 NMR 模拟的纠缠或伪纠缠。在小尺寸系统中观察到的伪纠缠已经显示出奇异行为，这种特征与量子相变的热力学极限中的特征在定性上相似，包括无限阶临界点。实验结果说明了一种使用量子模拟器研究多体系统中量子相关性的成功方法。
