Long-Range Coherence and Multiple Steady States in a Lossy Qubit Array.

Shovan Dutta, Nigel R Cooper

OAI: oai:www.repository.cam.ac.uk:1810/314992 • DOI: 10.17863/CAM.62100

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.

cond-mat.quant-gas cond-mat.quant-gas quant-ph