237 citations · 1.5k across the 41 of their papers we have counts for
42 papers
Correspondence between Asymptotic Quantum Many-Body Scars in Closed Systems and Diffusive Nambu-Goldstone Modes in Open Systems
Masaya Kunimi, Taiki Haga, Masaya Nakagawa
Hydrodynamic relaxation in open quantum many-body systems can be understood in terms of diffusive Nambu--Goldstone (NG) modes associated with strong-to-weak spontaneous symmetry br…
Discontinuous strong-to-weak symmetry breaking transition from thermal pure states
Taiki Haga, Masaya Kunimi, Masaya Nakagawa
We investigate the nonequilibrium dynamics of strong-to-weak spontaneous symmetry breaking in many-body quantum systems undergoing decoherence from thermal pure states. For generic…
Renormalization of Quantum Operations: Parity-Time Transition and Chaotic Flows
Atsushi Oyaizu, Hongchao Li, Masaya Nakagawa +1
The renormalization group (RG) in statistical physics focuses on ground-state properties of equilibrium systems. However, it is unclear how it should be generalized to nonunitary q…
Topological Characterization of Discrete-Time Classical Stochastic Processes: Dual Role of Point-Gap Topology
Masaya Nakagawa, Masahito Ueda
We present topological characterization of classical stochastic processes described by discrete-time Markov chains on lattices. We point out that point-gap topology of stochastic m…
Ward-Takahashi Identity and Gauge-Invariant Response Theory for Open Quantum Systems
Hongchao Li, Xie-Hang Yu, Masaya Nakagawa +1
We derive the Ward-Takahashi identity and establish the gauge-invariant response theory for open quantum systems described by Lindbladians to show that particle-number conservation…
Non-Hermitian Renormalization Group from a Few-Body Perspective
Hiroyuki Tajima, Masaya Nakagawa, Haozhao Liang +1
Non-Hermiticity plays a fundamental role in open quantum systems and describes a wide variety of effects of interactions with environments, including quantum measurement. However,…
Kondo breakdown induced by non-Hermitian complex hybridization
Kazuki Yamamoto, Masaya Nakagawa, Norio Kawakami
Recently, a non-Hermitian Anderson impurity model with one-body loss has been studied in [Phys. Rev. B 111, 125157 (2025)}], and it has been demonstrated that the renormalization e…
Davies equation without the secular approximation: Reconciling locality with quantum thermodynamics for open quadratic systems
Koki Shiraishi, Masaya Nakagawa, Takashi Mori
We derive a thermodynamically consistent quantum master equation that satisfies locality for quadratic systems coupled to independent and identical baths at each site. We show that…
Correlation versus dissipation in a non-Hermitian Anderson impurity model
Kazuki Yamamoto, Masaya Nakagawa, Norio Kawakami
We analyze the competition between strong correlations and dissipation in quantum impurity systems from the Kondo regime to the valence fluctuation regime by developing a slave-bos…
Dissipative Superfluidity in a Molecular Bose-Einstein Condensate
Hongchao Li, Xie-Hang Yu, Masaya Nakagawa +1
Motivated by recent experimental realization of a Bose-Einstein condensate (BEC) of dipolar molecules, we develop superfluid transport theory for a dissipative BEC to show that a w…
Quantum master equation for many-body systems: Derivation based on the Lieb-Robinson bound
Koki Shiraishi, Masaya Nakagawa, Takashi Mori +1
The local Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) quantum master equation is a powerful tool for the study of open quantum many-body systems. However, its microscopic derivati…
Topology of Discrete Quantum Feedback Control
Masaya Nakagawa, Masahito Ueda
A general framework for analyzing the topology of quantum channels of single-particle systems is developed to find a class of genuinely dynamical topological phases that can be rea…
Experimental observation of the Yang-Lee quantum criticality in open systems
Huixia Gao, Kunkun Wang, Lei Xiao +6
The Yang-Lee edge singularity was originally studied from the standpoint of mathematical foundations of phase transitions, and its physical demonstration has been of active interes…
Metastable ferromagnetic clusters in dissipative many-body systems of polar molecules
Naoki Hara, Masaya Nakagawa
We investigate the effect of two-body loss due to chemical reactions on quantum magnetism of fermionic polar molecules in an optical lattice. We show that an interplay between diss…
Maxwell's demon for quantum transport
Kangqiao Liu, Masaya Nakagawa, Masahito Ueda
While most of the existing quantum information engines assisted by Maxwell's demon harness thermal fluctuations, those that rectify only quantum fluctuations have recently been con…
Quasiparticles of Decoherence Processes in Open Quantum Many-Body Systems: Incoherentons
Taiki Haga, Masaya Nakagawa, Ryusuke Hamazaki +1
The relaxation dynamics of an open quantum system is determined by the competition between the coherent Hamiltonian dynamics of a system and the dissipative dynamics due to interac…
Yang-Lee Zeros, Semicircle Theorem, and Nonunitary Criticality in Bardeen-Cooper-Schrieffer Superconductivity
Hongchao Li, Xie-Hang Yu, Masaya Nakagawa +1
Yang and Lee investigated phase transitions in terms of zeros of partition functions, namely, Yang-Lee zeros [Phys. Rev. 87, 404 (1952); Phys. Rev. 87, 410 (1952)]. We show that th…
Lindbladian Many-Body Localization
Ryusuke Hamazaki, Masaya Nakagawa, Taiki Haga +1
We discover a novel localization transition that alters the dynamics of coherence in disordered many-body spin systems subject to Markovian dissipation. The transition occurs in th…
Observation of the Sign Reversal of the Magnetic Correlation in a Driven-Dissipative Fermi Gas in Double Wells
Kantaro Honda, Shintaro Taie, Yosuke Takasu +3
We report the observation of the sign reversal of the magnetic correlation from antiferromagnetic to ferromagnetic in a dissipative Fermi gas in double wells, utilizing the dissipa…
Exact eigenstates of multicomponent Hubbard models: SU() magnetic pairing, weak ergodicity breaking, and partial integrability
Masaya Nakagawa, Hosho Katsura, Masahito Ueda
We construct exact eigenstates of multicomponent Hubbard models in arbitrary dimensions by generalizing the -pairing mechanism. Our models include the SU() Hubbard model as a…
Universal properties of dissipative Tomonaga-Luttinger liquids: Case study of a non-Hermitian XXZ spin chain
Kazuki Yamamoto, Masaya Nakagawa, Masaki Tezuka +2
We demonstrate the universal properties of dissipative Tomonaga-Luttinger (TL) liquids by calculating correlation functions and performing finite-size scaling analysis of a non-Her…
Kondo Effect in a Quantum Dot under Continuous Quantum Measurement
Masahiro Hasegawa, Masaya Nakagawa, Keiji Saito
The backaction of quantum measurement on the Kondo effect in a quantum dot system is investigated by considering continuous projective measurement of singly occupied states of a qu…
Pairing of Light-Emitting Fermions: Nonequilibrium Pairing Mechanism at High Temperatures
Masaya Nakagawa, Naoto Tsuji, Norio Kawakami +1
Strongly interacting fermionic atoms are shown to develop -pairing superfluid correlations in a nonequilibrium steady state in the presence of spontaneous emission of light from…
Tachyonic and Plasma Instabilities of -Pairing States Coupled to Electromagnetic Fields
Naoto Tsuji, Masaya Nakagawa, Masahito Ueda
Cooper pairs featuring a nonzero center-of-mass crystal momentum and an off-diagonal long-range order (-pairing states) constitute exact eigenstat…