论文标题
用三维亚波长原子阵列介导的完全相干偶极子 - 偶极相互作用的量子模拟
Quantum simulation with fully coherent dipole--dipole-interactions mediated by three-dimensional subwavelength atomic arrays
论文作者
论文摘要
使用冷原子的量子模拟器是解决量子多体问题的最有希望的方法之一。纳米光结构被广泛用于设计光的带结构，因此被研究为调整附近原子之间相互作用的一种手段。这种方法的关键缺点是激发可以腐烂成游离光子，从而限制了这种量子模拟器的连贯性。在这里，我们通过建议使用简单的三维原子阵列来克服这一挑战，从而产生全向带式的带隙，并表明它可以使嵌入式杂质之间的相干，无耗散的相互作用。我们明确地表明，对于中等晶格的大小和有限的填充分数，频带差距持续存在，这使得在实验中很容易观察到这种效果。我们的工作铺平了使用Ultracold Atomic lattices进行远距离相互作用的模拟自旋量子模拟器的道路，并且是原子量子超材料的新兴领域的一个实例。
Quantum simulators employing cold atoms are among the most promising approaches to tackle quantum many-body problems. Nanophotonic structures are widely employed to engineer the bandstructure of light and are thus investigated as a means to tune the interactions between atoms placed in their vicinity. A key shortcoming of this approach is that excitations can decay into free photons, limiting the coherence of such quantum simulators. Here, we overcome this challenge by proposing to use a simple cubic three-dimensional array of atoms to produce an omnidirectional bandgap for light and show that it enables coherent, dissipation-free interactions between embedded impurities. We show explicitly that the band gaps persist for moderate lattice sizes and finite filling fraction, which makes this effect readily observable in experiment. Our work paves the way toward analogue spin quantum simulators with long-range interactions using ultracold atomic lattices, and is an instance of the emerging field of atomic quantum metamaterials.
