Long-Range Coherence and Multiple Steady States in a Lossy Qubit Array.
Physical review letters
American Physical Society
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Dutta, S., & Cooper, N. (2020). Long-Range Coherence and Multiple Steady States in a Lossy Qubit Array.. Physical review letters, 125 (24), 240404. https://doi.org/10.1103/physrevlett.125.240404
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.
EPSRC (via University of Strathclyde) (EP/P009565/1)
Simons Foundation (511029)
External DOI: https://doi.org/10.1103/physrevlett.125.240404
This record's URL: https://www.repository.cam.ac.uk/handle/1810/314992
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