The vacuum state of a free massive scalar field satisfies the Leggett-Garg inequality under a spacelike-separated noninvasive measurement protocol using sign of the smeared field observable.
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Leggett-Garg inequality in the massive scalar vacuum: No violation under spacelike-separated measurements
The vacuum state of a free massive scalar field satisfies the Leggett-Garg inequality under a spacelike-separated noninvasive measurement protocol using sign of the smeared field observable.