23 citations · 70 across the 14 of their papers we have counts for
14 papers
Probing many-body localization crossover in quasiperiodic Floquet circuits on a quantum processor
Kazuma Nagao, Tomonori Shirakawa, Rongyang Sun +2
Many-body localization (MBL) provides a mechanism by which interacting quantum systems evade thermalization, leading to persistent memory of initial conditions and slow entanglemen…
Pulse-based optimization of quantum many-body states with Rydberg atoms in optical tweezer arrays
Kazuma Nagao, Sergi Julià-Farré, Joseph Vovrosh +2
We explore a pulse-based variational quantum eigensolver (VQE) algorithm for Rydberg atoms in optical tweezer arrays and evaluate its performance on prototypical quantum spin model…
Melting of a Bosonic Mott Insulator in Kagome Optical Lattices with Sign-Inverted Hopping
Kazuma Nagao, Daisuke Yamamoto, Seiji Yunoki +1
Using the discrete truncated Wigner approximation (dTWA), we investigate the nonequilibrium dynamics of ultracold bosons confined in optical kagome lattices, focusing on both unfru…
Two-dimensional correlation propagation dynamics with a cluster discrete phase-space method
Kazuma Nagao, Seiji Yunoki
Nonequilibrium dynamics of highly-controlled quantum systems is a challenging issue in statistical physics and quantum many-body physics, relevant to recent experimental developmen…
Discrete-phase-space method for driven-dissipative dynamics of strongly interacting bosons in optical lattices
Kazuma Nagao, Ippei Danshita, Seiji Yunoki
We develop a discrete truncated Wigner method to analyze the real-time evolution of dissipative SU() spin systems coupled with a Markovian environment. This semiclassical…
Squeezed-field path-integral description of BCS superconductors
Kazuma Nagao, Dapeng Li, Ludwig Mathey
We develop a squeezed-field path-integral representation for BCS superconductors utilizing a generalized completeness relation of squeezed-fermionic coherent states. We derive a Gr…
Fluctuations of squeezing fields beyond the Tomonaga--Luttinger liquid paradigm
Kazuma Nagao, Ludwig Mathey
The concept of Tomonaga--Luttinger liquids (TLL) on the basis of the free-boson models is ubiquitous in theoretical descriptions of low-energy properties in one-dimensional quantum…
Performance evaluation of the discrete truncated Wigner approximation for quench dynamics of quantum spin systems with long-range interactions
Masaya Kunimi, Kazuma Nagao, Shimpei Goto +1
The discrete truncated Wigner approximation (DTWA) is a powerful tool for analyzing dynamics of quantum spin systems. Since the DTWA includes the leading-order quantum corrections…
SU(3) truncated Wigner approximation for strongly interacting Bose gases
Kazuma Nagao, Yosuke Takasu, Yoshiro Takahashi +1
We develop and utilize the SU(3) truncated Wigner approximation (TWA) in order to analyze far-from-equilibrium quantum dynamics of strongly interacting Bose gases in an optical lat…
Semiclassical dynamics of a dark soliton in a one-dimensional bosonic superfluid in an optical lattice
Yusuke Ozaki, Kazuma Nagao, Ippei Danshita +1
We study quantum dynamics of a dark soliton in a one-dimensional Bose gas in an optical lattice within the truncated Wigner approximation. A previous work has revealed that in the…
Energy redistribution and spatio-temporal evolution of correlations after a sudden quench of the Bose-Hubbard model
Yosuke Takasu, Tomoya Yagami, Hiroto Asaka +5
An optical-lattice quantum simulator is an ideal experimental platform to investigate non-equilibrium dynamics of a quantum many-body system, which is in general hard to simulate w…
Semiclassical quench dynamics of Bose gases in optical lattices
Kazuma Nagao, Masaya Kunimi, Yosuke Takasu +2
We analyze the time evolution of the Bose-Hubbard model after a sudden quantum quench to a weakly interacting regime. Specifically, motivated by a recent experiment at Kyoto Univer…
Response of the Higgs amplitude mode of superfluid Bose gases in a three dimensional optical lattice
Kazuma Nagao, Yoshiro Takahashi, Ippei Danshita
We study the Higgs mode of superfluid Bose gases in a three dimensional optical lattice, which emerges near the quantum phase transition to the Mott insulator at commensurate filli…
Damping of the Higgs and Nambu-Goldstone modes of superfluid Bose gases at finite temperatures
Kazuma Nagao, Ippei Danshita
We study collective modes of superfluid Bose gases in optical lattices at commensurate fillings. We focus on the vicinity of the quantum phase transition to the Mott insulator, whe…