University of Cambridge > > Collective Phenomena Group Meeting (CPGM) Seminars > Long-range entanglement and multistability in a lossy qubit array

Long-range entanglement and multistability in a lossy qubit array

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We identify a simple experimental setting of a locally pumped and lossy array of two-level quantum systems that can stabilize multiple highly coherent steady states. By 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. These nonequilibrium states arise from a hidden symmetry that stabilizes Bell pairs over arbitrarily long distances, leading to controllable long-range entanglement. We show how to selectively prepare and observe the steady states in existing setups. Our conclusions apply to a broad range of two-level systems.

The talk will be based on [1] arXiv 2004.07981 (main reference) [2] arXiv 2007.08938.

This talk is part of the Collective Phenomena Group Meeting (CPGM) Seminars series.

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