Long-range entanglement and multiple steady states in a lossy qubit array

by Dr Shovan Dutta (University of Cambridge)

Thursday 26 Nov 2020, 16:00 → 17:00 Asia/Kolkata

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Environmental coupling typically drives a quantum system to a unique steady state with very little coherence, which is a major obstacle for quantum information processing. I will talk about a simple experimental setting of an array of two-level systems with localised pump and loss that has multiple highly coherent steady states, including maximally entangled states of nonlocal Bell pairs. Such states originate from a hidden symmetry that conserves Bell pairs over long distances, leading to controllable long-range entanglement. I will discuss how to selectively prepare and observe these states in existing setups. Ref: https://arxiv.org/abs/2004.07981 (to appear in PRL).