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arXiv · 2604.26600

Entanglement Revivals and Scrambling for Evaporating Black Holes

Levy B. N. Batista·Nicolò Bragagnolo·Rhys Holmes·S. Prem Kumar
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Abstract

We investigate the spreading of entanglement, and entanglement memory effects, in two-dimensional conformal field theory (CFT) propagating on evaporating black hole backgrounds. Memory effects leading to late-time spikes in mutual information for widely separated intervals are well known in CFTs admitting a quasiparticle description. In this work we examine the effect of black hole scrambling on late time mutual information spikes for disjoint intervals in free fermion CFT prepared in a thermofield double state. Late-time entanglement revival is driven by island-induced purification of modes in the union of the intervals. We show across two distinct 2d gravity models, Jackiw-Teitelboim (JT) gravity and the Russo-Susskind-Thorlacius (RST) model, that parametrically dialing up black hole scrambling time smooths out and suppresses entanglement spikes until they disappear at a critical scale, interpolating between free quasiparticle and maximal scrambling pictures. At the critical point, the interval lengths are exponential in black hole scrambling time. We further find a very closely related effect manifest as an entanglement dip for a single interval in a single-sided evaporating RST black hole.

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Levy B. N. Batista, Nicolò Bragagnolo, Rhys Holmes, S. Prem Kumar. 2026-04-29. Entanglement Revivals and Scrambling for Evaporating Black Holes. https://arxiv.org/abs/2604.26600

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