D-Wave Systems, 3033 Beta Avenue, Burnaby, BC V5G 4M9, Canada.
Department of Physics, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.
Science. 2018 Jul 13;361(6398):162-165. doi: 10.1126/science.aat2025.
Understanding magnetic phases in quantum mechanical systems is one of the essential goals in condensed matter physics, and the advent of prototype quantum simulation hardware has provided new tools for experimentally probing such systems. We report on the experimental realization of a quantum simulation of interacting Ising spins on three-dimensional cubic lattices up to dimensions 8 × 8 × 8 on a D-Wave processor (D-Wave Systems, Burnaby, Canada). The ability to control and read out the state of individual spins provides direct access to several order parameters, which we used to determine the lattice's magnetic phases as well as critical disorder and one of its universal exponents. By tuning the degree of disorder and effective transverse magnetic field, we observed phase transitions between a paramagnetic, an antiferromagnetic, and a spin-glass phase.
理解量子力学系统中的磁性相是凝聚态物理的基本目标之一，而原型量子模拟硬件的出现为实验探测这类系统提供了新的工具。我们报告了在加拿大 D-Wave 系统公司（Burnaby, Canada）的 D-Wave 处理器上，对三维立方晶格上的相互作用伊辛自旋进行量子模拟的实验实现，其尺寸最高可达 8×8×8。控制和读出单个自旋的状态的能力提供了对几个序参量的直接访问，我们用这些序参量来确定晶格的磁性相以及临界无序和其一个通用指数。通过调节无序和有效横向磁场的程度，我们观察到了在顺磁相、反铁磁相和自旋玻璃相之间的相变。
