报告题目：Roton en量子论坛第一百一十九讲

tanglement in quenched dipolar Bose-Einstein condensates

报告人：田泽华， 副研究员，中国科学技术大学

报告时间：12月29日 下午4:00–5:00

报告地点：量子楼410

报告摘要：For a quasi-two-dimensional dipolar Bose-Einstein condensates, the Bogoliubov excitation spectrum displays, at sufficiently large gas density, a deep roton minimum due to the spatially anisotropic behavior of the dipolar two-body potential. A rapid quench, performed on the speed of sound of excitations propagating on the condensate background, leads to the dynamical Casimir effect, which can be characterized by measuring the density-density correlation function. It is shown, for both zero and finite initial temperatures, that the continuous-variable bipartite quantum state of the created quasiparticle pairs with opposite momenta, resulting from the quench, displays an enhanced potential for the presence of entanglement (represented by nonseparable and steerable quasiparticle states), when compared to a gas with solely repulsive contact interactions. Steerable quasiparticle pairs contain momenta close to the roton, and hence quantum correlations significantly increase in the presence of a deep roton minimum. Besides, I will discuss that the means of measuring entanglement here can be used in the analogue gravity systems.

报告人简介：田泽华，中国科学技术大学副研究员，韩国首尔大学和波兰华沙大学博士后。在相对论量子信息和类比引力研究方面开展了一系列研究工作，在JHEP、Phys. Rev. D、Phys. Rev. A、Phys. Lett. B等国际一流SCI期刊上发表论文20余篇。