论文标题
远程连贯性和有损量子阵列中的多个稳态
Long-Range Coherence and Multiple Steady States in a Lossy Qubit Array
论文作者
论文摘要
我们表明，两级量子系统的本地泵送和有损阵列的简单实验设置可以稳定较强的远距离连贯性。确实，通过明确的分析结构，我们表明，尽管这是一个相互作用的开放多体问题，但从微小到最大纠缠中有一组广泛的稳态密度运算符。这种非平衡的稳态态由隐藏的对称性产生，该对称性稳定在任意长的距离上，并具有独特的实验特征。我们演示了一个协议，可以通过该方案使用耗散选择性地准备这些状态。我们的发现可以在当今的实验中访问。
We show that a simple experimental setting of a locally pumped and lossy array of two-level quantum systems can stabilize states with strong long-range coherence. Indeed, by explicit analytic construction, we show there is an extensive set of steady-state density operators, from minimally to maximally entangled, despite this being an interacting open many-body problem. Such nonequilibrium steady states arise from a hidden symmetry that stabilizes Bell pairs over arbitrarily long distances, with unique experimental signatures. We demonstrate a protocol by which one can selectively prepare these states using dissipation. Our findings are accessible in present-day experiments.
