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

Authors
Cooper, Nigel R 

Change log
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.

Publication Date
2020-12-11
Online Publication Date
2020-12-09
Acceptance Date
2020-11-11
Keywords
cond-mat.quant-gas, cond-mat.quant-gas, quant-ph
Journal Title
Phys Rev Lett
Journal ISSN
0031-9007
1079-7114
Volume Title
125
Publisher
American Physical Society (APS)
Rights
All rights reserved
Sponsorship
Engineering and Physical Sciences Research Council (EP/P009565/1)
Simons Foundation (511029)