Kantian A, Langer S, Daley A J
Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden.
Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden.
Phys Rev Lett. 2018 Feb 9;120(6):060401. doi: 10.1103/PhysRevLett.120.060401.
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 corresponding dynamics showing that disentangling can be realized cleanly in ongoing 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 magnetically ordered states of bosons and fermions.
我们展示了如何通过动态解缠两层，利用实验中可用的双层晶格系统在一层中制备具有极低熵的量子多体态。这种解缠操作将一个层子系统A移动到一个区域，其中A中的激发形成单粒子能隙。结果，该操作直接映射到子系统A的冷却，熵被转移到另一层。对于玻色子和费米子原子，我们研究了相应的动力学，表明在正在进行的实验中可以清晰地实现解缠。相应的纠缠熵可以用量子气体显微镜直接测量，并且作为一种产生低熵态的工具，该技术开启了一系列应用，首先是简化玻色子和费米子磁有序态的制备。
