247 citations · 498 across the 34 of their papers we have counts for
34 papers
Topological Filtering and Emergent Kondo Scale
Ryosuke Yoshii, Rio Oto
We study the Kondo effect induced by a topological soliton in a one-dimensional Dirac system with the sign-changing mass term. The soliton hosts a localized zero mode whose spatial…
Topological-Mass Control of an Emergent Kondo Scale in an Interacting SSH Chain
Ryosuke Yoshii, Rio Oto
Topological bound states emerging at domain walls of dimerized chains provide a robust platform for exploring correlation effects beyond single-particle physics. When such a solito…
Simulating Quantum Field Theories with Boundaries in Curved Spacetimes Using Open Spin Systems
Shunichiro Kinoshita, Keiju Murata, Daisuke Yamamoto +1
We develop a framework to simulate quantum field theories (QFTs) with boundaries in -dimenmsional curved spacetimes by employing open spin systems. Building upon our previou…
Phase Transitions and Noise Robustness of Quantum Graph States
Tatsuya Numajiri, Shion Yamashika, Tomonori Tanizawa +3
Graph states are entangled states that are essential for quantum information processing. As experimental advances enable the realization of large-scale graph states, efficient fide…
Geometric Quantum Thermodynamic Engine under an Isothermal Operation: An Application of a Thouless Pumping
Ryosuke Yoshii, Hisao Hayakawa
Geometric pumping in open quantum systems is commonly described in terms of the Berry--Sinitsyn--Nemenman (BSN) curvature, which determines the geometric contribution to transporte…
Inhomogeneous entanglement structure in monoaxial chiral ferromagnetic quantum spin chain
Kentaro Nishimura, Ryosuke Yoshii
Chiral magnets, characterized by inhomogeneous magnetic moment arrangements, have attracted significant attention recently due to their topological orders, such as magnetic skyrmio…
Fermion Casimir effect and magnetic Larkin-Ovchinnikov phases
Antonino Flachi, Muneto Nitta, Satoshi Takada +1
This paper explores how magnetic fields affect the Casimir effect within the context of a simple quasi-1D interacting fermionic system. A novel phenomenon emerges, resulting from t…
Violation of the Leggett-Garg inequality for dynamics of a Bose-Einstein condensate in a double-well potential
Tsubasa Sakamoto, Ryosuke Yoshii, Shunji Tsuchiya
The Leggett-Garg inequality (LGI) serves as a criterion to determine the adherence of macroscopic system dynamics to macrorealism, as introduced by Leggett and Garg. A violation of…
Simplest fidelity-estimation method for graph states with depolarizing noise
Tomonori Tanizawa, Yuki Takeuchi, Shion Yamashika +2
Graph states are entangled states useful for several quantum information processing tasks such as measurement-based quantum computation and quantum metrology. As the size of graph…
Evolution of entanglement entropy in strongly correlated bosons in an optical lattice
Shion Yamashika, Daichi Kagamihara, Ryosuke Yoshii +1
We investigate the time evolution of the second-order Rényi entropy (RE) for bosons in a one-dimensional optical lattice following a sudden quench of the hopping amplitude . Spe…
Rényi entanglement entropy after a quantum quench starting from insulating states in a free boson system
Daichi Kagamihara, Ryui Kaneko, Shion Yamashika +4
We investigate the time-dependent Rényi entanglement entropy after a quantum quench starting from the Mott-insulating and charge-density-wave states in a one-dimensional free boson…
Demon driven by geometric phase
Ryosuke Yoshii, Hisao Hayakawa
We theoretically study the entropy production and the work extracted from a system connected to two reservoirs by periodic modulations of the electrochemical potentials of the rese…
Passive verification protocol for thermal graph states
Kazuki Akimoto, Shunji Tsuchiya, Ryosuke Yoshii +1
Graph states are entangled resource states for universal measurement-based quantum computation. Although matter qubits such as superconducting circuits and trapped ions are promisi…
Geometrical Quantum Chemical Engine
Hisao Hayakawa, Ville M. M. Paasonen, Ryosuke Yoshii
We propose a geometrical engine undergoing an adiabatic (Thouless) pumping process for a small system connected to external isothermal reservoirs with the control of electrochemica…
Twisted kink crystal in holographic superconductor
Masataka Matsumoto, Ryosuke Yoshii
Holographic superconductor model represents various inhomogeneous solutions with homogeneous sources. In this paper, we study inhomogeneous structures in the presence of the homoge…
Stability of supercurrents in a superfluid phase of spin-1 bosons in an optical lattice
Shion Yamashika, Ryosuke Yoshii, Shunji Tsuchiya
We study collective modes and superfluidity of spin-1 bosons with antiferromagnetic interactions in an optical lattice based on the time-dependent Ginzburg-Landau (TDGL) equation d…
Entanglement propagation in thermalization of an isolated quantum system
Ryosuke Yoshii, Shion Yamashika, Shunji Tsuchiya
We study dynamics of entanglement in the thermalization process of an isolated quantum many-body system. We propose a simple setup for measuring the propagation speed of entangleme…
Kink Crystalline Condensate and Multi-kink Solution in Holographic Superconductor
Masataka Matsumoto, Shin Nakamura, Ryosuke Yoshii
The theory of superconductivity can be divided into two groups depending on whether it has multi-kink solutions. For example, the BCS theory and the Gross-Neveu model have metastab…
Ground state modulations in the model
Antonino Flachi, Guglielmo Fucci, Muneto Nitta +2
In this work we examine a system consisting of a confined one-dimensional arrangement of atoms that we describe by using the 2-dimensional model, restricted to…
Nambu-Jona Lasinio and Nonlinear Sigma Models in Condensed Matter Systems
Ryosuke Yoshii, Muneto Nitta
We review various connections between condensed matter systems with the Nambu-Jona Lasinio model and nonlinear sigma models. The field theoretical description of interacting system…
Hidden charge-conjugation, parity, and time-reversal symmetries and massive Goldstone (Higgs) modes in superconductors
Shunji Tsuchiya, Daisuke Yamamoto, Ryosuke Yoshii +1
A massive Goldstone (MG) mode, often referred to as a Higgs amplitude mode, is a collective excitation that arises in a system involving spontaneous breaking of a continuous symmet…
Confining solitons in the Higgs phase of model: Self-consistent exact solutions in large- limit
Muneto Nitta, Ryosuke Yoshii
The quantum model is in the confining (or unbroken) phase with a full mass gap in an infinite space, while it is in the Higgs (broken or deconfinement) phase a…
Self-consistent Analytic Solutions in Twisted Model in the Large- Limit
Muneto Nitta, Ryosuke Yoshii
We construct self-consistent analytic solutions in the model in the large- limit, in which more than one Higgs scalar component take values inside a single…
Casimir Force for the Model
Antonino Flachi, Muneto Nitta, Satoshi Takada +1
In this work, we derive exact self-consistent solutions to the gap equations of the model on a finite interval with Dirichlet boundary conditions in the large-$…