Long-Range Coherence and Multiple Steady States in a Lossy Qubit Array
arXiv:2004.07981 · doi:10.1103/PhysRevLett.125.240404
Abstract
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.
Accepted version: 4 pages, 3 figures + supplement (includes minor refinements and additional sections in the supplement)
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