280 citations · 1.8k across the 30 of their papers we have counts for
30 papers
Bridging two quantum quench problems -- local joining quantum quench and Möbius quench -- and their holographic dual descriptions
Jonah Kudler-Flam, Masahiro Nozaki, Tokiro Numasawa +2
We establish an equivalence between two different quantum quench problems, the joining local quantum quench and the Möbius quench, in the context of -dimensional conformal f…
Spatial deformation of many-body quantum chaotic systems and quantum information scrambling
Kanato Goto, Taozhi Guo, Tomoki Nosaka +3
We study the effect of spatial inhomogeneity on quantum information scrambling, a process of spreading and locally hiding quantum information in quantum many-body systems. As a par…
Scrambling and Recovery of Quantum Information in Inhomogeneous Quenches in Two-dimensional Conformal Field Theories
Kanato Goto, Masahiro Nozaki, Shinsei Ryu +2
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 thermofield…
Entanglement Dynamics of the Non-Unitary Holographic Channel
Kanato Goto, Masahiro Nozaki, Kotaro Tamaoka +1
We study the dynamical properties of a strongly scrambling quantum circuit involving a projective measurement on a finite-sized region by studying the operator entanglement entropy…
Chaos by Magic
Kanato Goto, Tomoki Nosaka, Masahiro Nozaki
There is a property of a quantum state called magic. It measures how difficult for a classical computer to simulate the state. In this paper, we study magic of states in the integr…
Non-Equilibrating a Black Hole with Inhomogeneous Quantum Quench
Kanato Goto, Masahiro Nozaki, Shinsei Ryu +2
We study quantum quench processes in (1+1)-dimensional conformal field theory (CFT) in which the initial thermal equilibrium (Gibbs) state is time-evolved by spatially inhomogeneou…
Information Scrambling Versus Quantum Revival Through the Lens of Operator Entanglement
Kanato Goto, Ali Mollabashi, Masahiro Nozaki +2
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 i…
Subregion Spectrum Form Factor via Pseudo Entropy
Kanato Goto, Masahiro Nozaki, Kotaro Tamaoka
We introduce a subsystem generalization of the spectral form factor via pseudo entropy, the von-Neumann entropy for the reduced transition matrix. We consider a transition matrix b…
Local Operator Entanglement in Spin Chains
Eric Mascot, Masahiro Nozaki, Masaki Tezuka
Understanding how and whether local perturbations can affect the entire quantum system is a fundamental step in understanding non-equilibrium phenomena such as thermalization. This…
Entanglement of Local Operators and the Butterfly Effect
Jonah Kudler-Flam, Masahiro Nozaki, Shinsei Ryu +1
We study the robustness of quantum and classical information to perturbations implemented by local operator insertions. We do this by computing multipartite entanglement measures i…
Quantum vs. classical information: operator negativity as a probe of scrambling
Jonah Kudler-Flam, Masahiro Nozaki, Shinsei Ryu +1
We consider the logarithmic negativity and related quantities of time evolution operators. We study free fermion, compact boson, and holographic conformal field theories (CFTs) as…
Entanglement after Quantum Quenches in Lifshitz Scalar Theories
Keun-Young Kim, Mitsuhiro Nishida, Masahiro Nozaki +3
We study the time evolution of the entanglement entropy after quantum quenches in Lifshitz free scalar theories, with the dynamical exponent , by using the correlator method.…
Dynamics of logarithmic negativity and mutual information in smooth quenches
Hiroyuki Fujita, Mitsuhiro Nishida, Masahiro Nozaki +1
In this paper, we study how quantum correlation between subsystems changes in time by investigating time evolution of mutual information and logarithmic negativity in two protocols…
Holographic Duals of Inhomogeneous Systems: The Rainbow Chain and the Sine-Square Deformation Model
Ian MacCormack, Aike Liu, Masahiro Nozaki +1
A holographic dual description of inhomogeneous systems is discussed. Notably, finite temperature results for the entanglement entropy in both the rainbow chain and the SSD model a…
Signature of quantum chaos in operator entanglement in 2d CFTs
Laimei Nie, Masahiro Nozaki, Shinsei Ryu +1
We study operator entanglement measures of the unitary evolution operators of (1+1)-dimensional conformal field theories (CFTs), aiming to uncover their scrambling and chaotic beha…
Entanglement Spreading and Oscillation
Mitsuhiro Nishida, Masahiro Nozaki, Yuji Sugimoto +1
We study dynamics of quantum entanglement in smooth global quenches with a finite rate, by computing the time evolution of entanglement entropy in 1 + 1 dimensional free scalar the…
Correspondence between Entanglement Growth and Probability Distribution of Quasi-Particles
Masahiro Nozaki, Naoki Watamura
We study the excess of (Renyi) entanglement entropy in various free field theories for the locally excited states defined by acting with local operators on the ground state. It is…
Quantum Quench and Scaling of Entanglement Entropy
Pawel Caputa, Sumit R. Das, Masahiro Nozaki +1
Global quantum quench with a finite quench rate which crosses critical points is known to lead to universal scaling of correlation functions as functions of the quench rate. In thi…
Quantum Entanglement of Locally Excited States in Maxwell Theory
Masahiro Nozaki, Naoki Watamura
In 4 dimensional Maxwell gauge theory, we study the changes of (Renyi) entangle-ment entropy which are defined by subtracting the entropy for the ground state from the one for the…
Charged Entanglement Entropy of Local Operators
Pawel Caputa, Masahiro Nozaki, Tokiro Numasawa
In this work we consider the time evolution of charged Renyi entanglement entropies after exciting the vacuum with local fermionic operators. In order to explore the information co…
Quantum Entanglement of Fermionic Local Operators
Masahiro Nozaki, Tokiro Numasawa, Shunji Matsuura
In this paper we study the time evolution of (Renyi) entanglement entropies for locally excited states in four dimensional free massless fermionic field theory. Locally excited sta…
On the definition of entanglement entropy in lattice gauge theories
Sinya Aoki, Takumi Iritani, Masahiro Nozaki +3
We focus on the issue of proper definition of entanglement entropy in lattice gauge theories, and examine a naive definition where gauge invariant states are viewed as elements of…
Entanglement of Local Operators in large N CFTs
Pawel Caputa, Masahiro Nozaki, Tadashi Takayanagi
We study Renyi and von-Neumann entanglement entropy of excited states created by local operators in large N (or large central charge) CFTs. First we point that a naive large N expa…
Notes on Quantum Entanglement of Local Operators
Masahiro Nozaki
This is an expanded version of the short report arXiv:1401.0539, where we stud- ied the (Renyi) entanglement entropies for the excited state defined by acting a given local operato…