Inherent quantum resources in the stationary spin chains
arxiv(2024)
Abstract
The standard way to generate many-body quantum correlations is via a
dynamical protocol: an initial product state is transformed by interactions
that generate non-classical correlations at later times. Here, we show that
many-body Bell correlations are inherently present in the eigenstates of a
variety of spin-1/2 chains. In particular, we show that the eigenstates and
thermal states of the collective Lipkin-Meshkov-Glick model possess many-body
Bell correlations. We demonstrate that the Bell correlations can take on
quantized values that change discontinuously with variations in the total
magnetization. Finally, we show that these many-body Bell correlations persist
even in the presence of both diagonal and off-diagonal disorder.
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