Spacetime states unify path integrals, pseudo-density matrices, Page-Wootters, and related formalisms by showing they arise as particular evaluations or quantum channels from the same object.
Entanglement of General Subregions in Time-Dependent States
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Timelike mutual information is positive and weak monotonicity holds for non-overlapping timelike subregions in AdS3-Vaidya holography, but the timelike strong subadditivity is violated for overlapping intervals while Araki-Lieb and subadditivity hold.
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Unifying spacetime approaches to quantum mechanics
Spacetime states unify path integrals, pseudo-density matrices, Page-Wootters, and related formalisms by showing they arise as particular evaluations or quantum channels from the same object.
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Entanglement inequalities for timelike intervals within dynamical holography
Timelike mutual information is positive and weak monotonicity holds for non-overlapping timelike subregions in AdS3-Vaidya holography, but the timelike strong subadditivity is violated for overlapping intervals while Araki-Lieb and subadditivity hold.