双层光晶格中原子的动力学解纠缠与冷却
Dynamical disentangling and cooling of atoms in bilayer optical lattices
摘要：
我们展示了如何实验可用的双层晶格系统可以用来制备量子多体状态，在一个层中的熵非常低，通过动态解开两层。这种解纠缠操作将一个层-子系统$A$ -移动到其中$A$中的激发产生单粒子能隙的状态。因此，该操作直接映射到子系统$A$的冷却，熵被穿梭到另一层。对于玻色子和费米子原子，我们研究了这个过程的动力学，并表明，解开可以实现干净的正在进行的光晶格实验。相应的纠缠熵可以用量子气体显微镜直接测量，并且作为产生低熵态的工具，这种技术从简化费米子的反铁磁有序态的产生开始，开辟了一系列应用。
英文摘要：
We show how experimentally available bilayer lattice systems can be used to prepare quantum many-body states with exceptionally low entropy in one layer, by dynamically disentangling the two layers. This disentangling operation moves one layer - subsystem $A$ - into a regime where excitations in $A$ develop a single-particle gap. As a result, this operation maps directly to cooling for subsystem $A$, with entropy being shuttled to the other layer. For both bosonic and fermionic atoms, we study the dynamics of this process, and show that disentangling can be realised cleanly in ongoing optical lattice experiments. The corresponding entanglement entropies are directly measurable with quantum gas microscopes, and as a tool for producing lower-entropy states, this technique opens a range of applications beginning with simplifying production of anti-ferromagnetically ordered states of fermions.
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