Fast control of interactions in an ultracold two atom system: Managing correlations and irreversibility
Fast control of interactions in an ultracold two atom system: Managing correlations and irreversibility
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DOI：
10.21468/scipostphys.6.2.021
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发表时间：
2018-06
期刊：
影响因子：
5.5
通讯作者：
Thomás Fogarty;Lewis Ruks;Jing Li;T. Busch
中科院分区：
文献类型：
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作者：
Thomás Fogarty;Lewis Ruks;Jing Li;T. Busch
我们设计并探索了一条绝热性（STA）的捷径，用于改变两个超冷、谐波俘获玻色子之间的相互作用强度。从最初不相关、不相互作用的粒子开始，我们假设通过费什巴赫共振对粒子间相互作用进行时间相关的调整，使得两个粒子在驱动结束时发生强烈的相互作用。然后通过检查系统的热力学性质（例如与系统中的非平衡激发相关的不可逆功）来量化 STA 的效率。我们还通过冯·诺依曼熵量化了两粒子态的纠缠，并表明 STA 过程中产生的纠缠与所需目标态的纠缠相匹配。鉴于超冷原子物理学中双原子问题的基本性质，所提出的捷径预计将对许多依赖粒子间相互作用的过程产生重大影响。
We design and explore a shortcut to adiabaticity (STA) for changing the interaction strength between two ultracold, harmonically trapped bosons. Starting from initially uncorrelated, non-interacting particles, we assume a time-dependent tuning of the inter-particle interaction through a Feshbach resonance, such that the two particles are strongly interacting at the end of the driving. The efficiency of the STA is then quantified by examining the thermodynamic properties of the system, such as the irreversible work, which is related to the out-of-equilibrium excitations in the system. We also quantify the entanglement of the two-particle state through the von Neumann entropy and show that the entanglement produced in the STA process matches that of the desired target state. Given the fundamental nature of the two-atom problem in ultracold atomic physics, the presented shortcut can be expected to have significant impact on many processes that rely on inter-particle interactions.