Engineering tunable local loss in a synthetic lattice of momentum states
Engineering tunable local loss in a synthetic lattice of momentum states
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DOI：
10.1088/1367-2630/ab1147
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发表时间：
2018-11
影响因子：
3.3
通讯作者：
S. Lapp;Jackson Ang'ong'a;F. An;B. Gadway
中科院分区：
文献类型：
--
作者：
S. Lapp;Jackson Ang'ong'a;F. An;B. Gadway
耗散可以作为控制开放量子系统行为的强大资源。最近，人们对耗散耦合对大量子系统的影响产生了浓厚的兴趣，更具体地说，这些过程如何影响能带拓扑和多体局域化等现象。在这里，我们探讨工程的本地，可调耗散在所谓的合成晶格，量子态的阵列，参数耦合的方式类似于量子隧穿。考虑到动量态晶格的具体情况，我们研究了两种不同的机制，工程控制的损失：一个依赖于一个明确的形式的耗散自发辐射，另一个依赖于可逆耦合到一个大水库的未占用状态。我们实验实现后者，并展示了在很大范围内调整本地损耗系数的能力。在合成晶格工具箱中引入受控损耗有望为研究耗散与拓扑、无序和相互作用的相互作用铺平道路。
Dissipation can serve as a powerful resource for controlling the behavior of open quantum systems. Recently there has been a surge of interest in the influence of dissipative coupling on large quantum systems and, more specifically, how these processes can influence band topology and phenomena like many-body localization. Here, we explore the engineering of local, tunable dissipation in so-called synthetic lattices, arrays of quantum states that are parametrically coupled in a fashion analogous to quantum tunneling. Considering the specific case of momentum-state lattices, we investigate two distinct mechanisms for engineering controlled loss: one relying on an explicit form of dissipation by spontaneous emission, and another relying on reversible coupling to a large reservoir of unoccupied states. We experimentally implement the latter and demonstrate the ability to tune the local loss coefficient over a large range. The introduction of controlled loss to the synthetic lattice toolbox promises to pave the way for studying the interplay of dissipation with topology, disorder, and interactions.