A spatial three-party Leggett-Garg inequality, Eq. (1), is violated by a Heisenberg spin chain; first-violation times scale linearly with distance between measurement sites.
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Spatial Leggett-Garg Inequalities
A spatial three-party Leggett-Garg inequality, Eq. (1), is violated by a Heisenberg spin chain; first-violation times scale linearly with distance between measurement sites.