论文标题
本地驱动的有损量子阵列的不平衡稳态
Out-of-equilibrium steady states of a locally driven lossy qubit array
论文作者
论文摘要
我们使用主方程方法在两个任意位点的量子阵列的稳态中找到了丰富的违反直觉特征。我们显示有一些设置，其中增加泵和损耗率建立了远距离连贯性。在足够强大的耗散状态下，源或下水道有效地在其相邻位点之间产生相关性，从而导致一类“谐振”几何形状的惊人密度波顺序。这种效果可以更广泛地用于设计非平衡阶段。我们表明，稳态对于硬核玻色子和自由费米子是不同的，并且与特殊情况下的稳态不同。它们通常是通过适用于弱耗散和强烈耗散的长期动态的通常适用的Ansatzes来解释的。我们的发现与现有的光子设置有关。
We find a rich variety of counterintuitive features in the steady states of a qubit array coupled to a dissipative source and sink at two arbitrary sites, using a master equation approach. We show there are setups where increasing the pump and loss rates establishes long-range coherence. At sufficiently strong dissipation, the source or sink effectively generates correlation between its neighboring sites, leading to a striking density-wave order for a class of "resonant" geometries. This effect can be used more widely to engineer nonequilibrium phases. We show the steady states are generically distinct for hard-core bosons and free fermions, and differ significantly from the ones found before in special cases. They are explained by generally applicable ansatzes for the long-time dynamics at weak and strong dissipation. Our findings are relevant for existing photonic setups.
