102 citations · 1.4k across the 61 of their papers we have counts for
61 papers
Bulk-Measurement-Induced Boundary Phase Transition in Toric Code and Gauge-Higgs Model
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Study of boundary phase transition in toric code under cylinder geometry via bulk projective measurement is reported. As the frequency of local measurement for bulk qubits is incre…
Blocking particle dynamics in diamond chain with spatially increasing flux
Tomonari Mizoguchi, Yoshihito Kuno, Yasuhiro Hatsugai
Spatial non-uniformity in tight-binding models serves as a source of rich phenomena. In this paper, we study a diamond-chain tight-binding model with a spatially-modulated magnetic…
Phase transition and evidence of fast-scrambling phase in measurement-only quantum circuit
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Information scrambling is nowadays one of the most important topics in various fields of research. Measurement-only circuit (MoC) exhibits specific information scrambling dynamics,…
symmetry and Berry phase of bosonic ladder
Yoshihito Kuno, Yasuhiro Hatsugai
Bose gas on a two-leg ladder exhibits an interesting topological phase. We show the presence of a bosonic symmetry-protected-topological (SPT) phase protected by sy…
Interplay between lattice gauge theory and subsystem codes
Yoshihito Kuno, Ikuo Ichinose
It is now widely recognized that the toric code is a pure gauge-theory model governed by a projective Hamiltonian with topological orders. In this work, we extend the interplay bet…
Production of lattice gauge-Higgs topological states in measurement-only quantum circuit
Yoshihito Kuno, Ikuo Ichinose
By imaginary-time evolution with Hamiltonian, an arbitrary state arrives in the system's ground state. In this work, we conjecture that this dynamics can be simulated by measuremen…
Emergence symmetry protected topological phase in spatially tuned measurement-only circuit
Yoshihito Kuno, Ikuo Ichinose
Topological phase transition induced by spatially-tuned single-site measurement is investigated in a measurement-only circuit, in which three different types of projective measurem…
Topological pump of quantum chain and Diophantine equation
Yasuhiro Hatsugai, Yoshihito Kuno
A topological pump of the quantum chain is proposed associated with a current due to a local gauge invariance of colored fermions. The invarian…
Purification and scrambling in a chaotic Hamiltonian dynamics with measurements
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Chaotic transverse-field Ising model with measurements exhibits interesting purification dynamics. Ensemble of non-unitary dynamics of a chaotic many-body system with measurements…
Quantum information spreading in random spin chains with topological order
Takahiro Orito, Yoshihito Kuno, Ikuo Ichinose
Quantum information spreading and scrambling in many-body systems attract interests these days. Tripartite mutual information (TMI) based on operator-based entanglement entropy (EE…
Information spreading and scrambling in disorder-free multiple-spin interacting models
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Tripartite mutual information (TMI) is an efficient observable to quantify the ability of scrambler for unitary time-evolution operator with quenched many-body Hamiltonian. In this…
Deformation of localized states and state transitions in systems of randomly hopping interacting fermions
Takahiro Orito, Yoshihito Kuno, Ikuo Ichinose
We numerically study the random-hopping fermions (the Cruetz ladder) with repulsion and investigate how the interactions deform localized eigenstates by means of the one particle-d…
Localization and slow-thermalization in a cluster spin model
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Novel cluster spin model with interactions and disorder is introduced and studied. In specific type of interactions, we find an extensive number of local integrals of motion (LIOMs…
Construction of interacting flat-band models by molecular-orbital representation: Correlation functions, energy gap, and entanglement
Tomonari Mizoguchi, Yoshihito Kuno, Yasuhiro Hatsugai
We calculate correlation functions of exactly-solvable one-dimensional flat-band models by utilizing the "molecular-orbital" representation. The models considered in this paper hav…
Topological pump and bulk-edge-correspondence in an extended Bose-Hubbard model
Yoshihito Kuno, Yasuhiro Hatsugai
An extended Bose-Hubbard model (EBHM) with three- and four-body constraints can be feasible in cold atoms in an optical lattice. A rich phase structure including various symmetry-p…
Interplay and competition between disorder and flat band in an interacting Creutz ladder
Takahiro Orito, Yoshihito Kuno, Ikuo Ichinose
We clarify the interplay and competition between disorder and flat band in the Creutz ladder with inter-particle interactions focusing on the system's dynamics. Without disorder, t…
Bulk-edge Correspondence in the Adiabatic Heuristic Principle
Koji Kudo, Yoshihito Kuno, Yasuhiro Hatsugai
Using the Laughlin's argument on a torus with two pin-holes, we numerically demonstrate that the discontinuities of the center-of-mass work well as an invariant of the pumping phen…
Multiple quantum scar states and emergent slow-thermalization in the flat-band system
Yoshihito Kuno, Tomonari Mizoguchi, Yasuhiro Hatsugai
Quantum many-body scars (QMBS) appear in a flat-band model with interactions on the saw-tooth lattice. The flat-band model includes a compact support localized eigenstates, called…
Square-root topological phase with time-reversal and particle-hole symmetry
Tsuneya Yoshida, Tomonari Mizoguchi, Yoshihito Kuno +1
Square-root topological phases have been discussed mainly for systems with chiral symmetry. In this paper, we analyze the topology of the squared Hamiltonian for systems preserving…
Flat band, spin-1 Dirac cone, and Hofstadter diagram in the fermionic square kagome model
Tomonari Mizoguchi, Yoshihito Kuno, Yasuhiro Hatsugai
We study characteristic band structures of the fermions on a square kagome lattice, one of the two-dimensional lattices hosting a corner-sharing network of triangles. We show that…
Flat-band full localization and symmetry-protected topological phase on bilayer lattice systems
Ikuo Ichinose, Takahiro Orito, Yoshihito Kuno
In this work, we present bilayer flat-band Hamiltonians, in which all bulk states are localized and specified by extensive local integrals of motion (LIOMs). The present systems ar…
Plateau transitions of spin pump and bulk-edge correspondence
Yoshihito Kuno, Yasuhiro Hatsugai
Sequential plateau transitions of quantum spin chains (=1,3/2,2 and 3) are demonstrated by a spin pump using dimerization and staggered magnetic field as synthetic dimensions. T…
Non-thermalized Dynamics of Flat-Band Many-Body Localization
Takahiro Orito, Yoshihito Kuno, Ikuo Ichinose
We find that a flat-band fermion system with interactions and without disorders exhibits non-thermalized ergodicity-breaking dynamics, an analog of many-body localization (MBL). In…
Observation of antiferromagnetic correlations in an ultracold SU() Hubbard model
Shintaro Taie, Eduardo Ibarra-García-Padilla, Naoki Nishizawa +6
Mott insulators are paradigms of strongly correlated physics, giving rise to phases of matter with novel and hard-to-explain properties. Extending the typical SU(2) symmetry of Mot…