Information Scrambling Versus Quantum Revival Through the Lens of Operator Entanglement

Abstract

In this paper, we look for signatures of quantum revivals in two-dimensional conformal field theories (2d CFTs) on a spatially compact manifold by using operator entanglement. It is believed that thermalization does not occur on spatially compact manifolds as the quantum state returns to its initial state which is a phenomenon known as quantum revival. We find that in CFTs such as the free fermion CFT, the operator mutual information exhibits quantum revival in accordance with the relativistic propagation of quasiparticles while in holographic CFTs, the operator mutual information does not exhibit this revival and the quasiparticle picture breaks down. Furthermore, by computing the tripartite operator mutual information, we find that the information scrambling ability of holographic CFTs can be weakened by the finite size effect. We propose a modification of an effective model known as the line tension picture to explain the entanglement dynamics due to the strong scrambling effect and find a close relationship between this model and the wormhole (Einstein-Rosen Bridge) in the holographic bulk dual.

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Cited by in corpus (8)

• Holographic Quantum Scars
• Scrambling and Recovery of Quantum Information in Inhomogeneous Quenches in Two-dimensional Conformal Field Theories
• Quantum information scrambling in non-Markovian open quantum systems
• Entanglement Dynamics of the Non-Unitary Holographic Channel
• Local Operator Entanglement in Spin Chains
• Ergodicity breaking and deviation from Eigenstate Thermalisation in relativistic QFT
• Spatially Structured Entanglement from Nonequilibrium Thermal Pure States
• Logarithmic growth of operator entanglement in a clean non-integrable circuit