Scrambling dynamics and out-of-time-ordered correlators in quantum many-body systems

S Xu, B Swingle - PRX quantum, 2024 - APS
This tutorial article introduces the physics of quantum information scrambling in quantum
many-body systems. The goals are to understand how to precisely quantify the spreading of …

Quantum entanglement in the Sachdev—Ye—Kitaev model and its generalizations

P Zhang - Frontiers of Physics, 2022 - Springer
Entanglement is one of the most important concepts in quantum physics. We review recent
progress in understanding the quantum entanglement in many-body systems using large-N …

Entangled multiplets and spreading of quantum correlations in a continuously monitored tight-binding chain

F Carollo, V Alba - Physical Review B, 2022 - APS
We analyze the dynamics of entanglement in a paradigmatic noninteracting system subject
to continuous monitoring of the local excitation densities. Recently, it was conjectured that …

Rényi mutual information in quantum field theory

J Kudler-Flam - Physical Review Letters, 2023 - APS
We study a proper definition of Rényi mutual information (RMI) in quantum field theory as
defined via the Petz Rényi relative entropy. Unlike the standard definition, the RMI we …

Scrambling and recovery of quantum information in inhomogeneous quenches in two-dimensional conformal field theories

K Goto, M Nozaki, S Ryu, K Tamaoka, MT Tan - Physical Review Research, 2024 - APS
We study various quantum quench processes induced by the Möbius/sine-square
deformation of the Hamiltonian in two-dimensional conformal field theories starting from the …

Product of random states and spatial (half-) wormholes

K Goto, Y Kusuki, K Tamaoka, T Ugajin - Journal of High Energy Physics, 2021 - Springer
A bstract We study how coarse-graining procedure of an underlying UV-complete quantum
gravity gives rise to a connected geometry. It has been shown, quantum entanglement plays …

Approximate symmetries and quantum error correction

ZW Liu, S Zhou - npj Quantum Information, 2023 - nature.com
Quantum error correction (QEC) is a key concept in quantum computation as well as many
areas of physics. There are fundamental tensions between continuous symmetries and …

Full counting statistics across the entanglement phase transition of non-Hermitian Hamiltonians with charge conservation

TG Zhou, YN Zhou, P Zhang - Physical Review B, 2023 - APS
Performing quantum measurements produces not only the expectation value of a physical
observable O but also the probability distribution P (o) of all possible outcomes o. The full …

Emergent symmetry in Brownian SYK models and charge dependent scrambling

L Agarwal, S Xu - Journal of High Energy Physics, 2022 - Springer
A bstract In this work, we introduce a symmetry-based approach to study the scrambling and
operator dynamics of Brownian SYK models at large finite N and in the infinite N limit. We …

Quantum partial information decomposition

SJ van Enk - Physical Review A, 2023 - APS
Partial information decomposition (PID) takes one step beyond Shannon's theory in
decomposing the information two variables, A and B, possess about a third variable, T, into …