ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Avinguda Carl-Friedrich Gauss 2, Castelldefels 08860, Spain.
Departament de Física Quàntica i Astrofísica, Facultat de Física, Universitat de Barcelona, Barcelona 08028, Spain.
Nat Commun. 2016 May 27;7:11524. doi: 10.1038/ncomms11524.
Exploiting quantum properties to outperform classical ways of information processing is an outstanding goal of modern physics. A promising route is quantum simulation, which aims at implementing relevant and computationally hard problems in controllable quantum systems. Here we demonstrate that in a trapped ion setup, with present day technology, it is possible to realize a spin model of the Mattis-type that exhibits spin glass phases. Our method produces the glassy behaviour without the need for any disorder potential, just by controlling the detuning of the spin-phonon coupling. Applying a transverse field, the system can be used to benchmark quantum annealing strategies which aim at reaching the ground state of the spin glass starting from the paramagnetic phase. In the vicinity of a phonon resonance, the problem maps onto number partitioning, and instances which are difficult to address classically can be implemented.
利用量子特性来超越经典的信息处理方法是现代物理学的一个杰出目标。一种有前途的途径是量子模拟，它旨在在可控量子系统中实现相关的和计算上困难的问题。在这里，我们证明在囚禁离子装置中，使用当今的技术，有可能实现马蒂斯（Mattis）型的自旋模型，该模型表现出自旋玻璃相。我们的方法在不需要任何无序势的情况下产生玻璃态行为，只需控制自旋-声子耦合的失谐即可。施加横向场，该系统可用于基准量子退火策略，该策略旨在从顺磁相出发达到自旋玻璃的基态。在声子共振附近，问题映射到数划分上，可以实现经典上难以解决的实例。
