学术报告 Generation of Macroscopic Singlet States in Hot Atomic Ensemble

时间：12月15日（周五）下午1:00

地点：物理楼226报告厅

摘要：Understanding strongly correlated states of many-body quantum systems is one of the most important open problems in modern physics, with applications in quantum simulation, computation, communication and sensing. In simulation, much of the interest focuses on unpolarized systems, for example frustrated anti-ferromagnets, which have been proposed as an explanation of high-Tc superconductivity. Such systems give rise to many non-equivalent phases distinguished by the distribution of “entanglement bonds,” i.e. singlet-type entanglements. Recent work in the group of Morgan Mitchell has demonstrated the generation of a macroscopic singlet state (MSS) containing at least 550,000 entangled atoms, by using QND measurement on unpolarized cold atomic ensembles. Here we proposed to realize bigger MSS by using high-density atomic ensembles and determine the spatial distribution of the generated entanglement bonds with gradient-based spatial addressing techniques from magnetic-resonance imaging.