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Temporal Entanglement from Holographic Entanglement Entropy

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arxiv 2507.17847 v2 pith:4WGPKU5T submitted 2025-07-23 hep-th quant-ph

Temporal Entanglement from Holographic Entanglement Entropy

classification hep-th quant-ph
keywords entanglementfieldquantumsubregiontemporalholographicprescriptionamounts
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Recently, several notions of entanglement in time have emerged as a novel frontier in quantum many-body physics, quantum field theory and gravity. We propose a systematic prescription to characterize temporal entanglement in relativistic quantum field theory in a general state for an arbitrary subregion on a flat, constant-time slice in a flat spacetime. Our prescriptions starts with the standard entanglement entropy of a spatial subregion and amounts to transporting the unchanged subregion to boosted time slices all the way across the light cone when it becomes in general a complex characterization of the corresponding temporal subregion. For holographic quantum field theories, our prescription amounts to an analytic continuation of all codimension-two bulk extremal surfaces satisfying the homology constraint and picking the one with the smallest real value of the area as the leading saddle point. We implement this prescription for holographic conformal field theories in thermal states on both a two-dimensional Lorentzian cylinder and three-dimensional Minkowski space, and show that it leads to results with self-consistent physical properties of temporal entanglement.

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Cited by 12 Pith papers

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