Brazilian Journal of Physics ( IF 1.5 ) Pub Date : 2021-04-23 , DOI: 10.1007/s13538-021-00904-9 Kalai K. Rajagopal , Gafurjan Ibragimov
We have studied the dynamics of a two-site Bose–Einstein condensate subject to tunnelling coupling (which makes the system a bosonic Josephson junction), having on-site inter-particle interaction (making the system a small Bose–Hubbard model) and in contact with two separate heat baths, which makes the system lossy and potentially drives it into a non-equilibrium state with some heat current. The dynamical calculation of the system is done within the standard quantum generalized Langevin setting, and the heat baths are assumed to have non-zero memory time (Ornstein–Uhlenbeck process). We numerically calculated the time evolution of the population imbalance, coherence and entanglement of the system. We have shown inter-particle interaction, noise and dissipation induced by BEC atoms-reservoir interaction that are crucial in affecting the dynamics of the mentioned physical parameters. The study also indicates that quantumness (non-classicality) of the system is characterized by the interplay between dissipation and inter-particle interaction.
中文翻译:
双井玻色-爱因斯坦凝析油双油藏系统的非平衡动力学
我们研究了受隧穿耦合(使系统成为玻色约瑟夫森结)、具有现场粒子间相互作用(使系统成为小型 Bose-Hubbard 模型)和在与两个独立的热浴接触,这会使系统有损并可能通过一些热流将其驱动到非平衡状态。系统的动力学计算是在标准量子广义朗之万设置内完成的,并且假定热浴具有非零记忆时间(Ornstein-Uhlenbeck 过程)。我们数值计算了系统人口失衡、连贯性和纠缠的时间演化。我们已经展示了粒子间的相互作用,BEC 原子-储层相互作用引起的噪声和耗散,这对于影响上述物理参数的动力学至关重要。该研究还表明,系统的量子性(非经典性)以耗散和粒子间相互作用之间的相互作用为特征。