204 citations · 645 across the 23 of their papers we have counts for
23 papers
Effective Hamiltonian description on monitored Majorana chains: correlated power-law hoppings and unconventional entanglement scaling
Ken Mochizuki, Hisanori Oshima, Ryusuke Hamazaki +1
We investigate the structures of effective Hamiltonians governing monitored dynamics of a one-dimensional Majorana chain through the Lyapunov spectral analysis. We focus on a gaple…
Phase transitions in coupled Ising chains and SO()-symmetric spin chains
Yohei Fuji, Sylvain Capponi, Lukas Devos +1
We investigate the nature of quantum phase transitions in a (1+1)-dimensional field theory composed of copies of the Ising conformal field theory interacting via competing rele…
An introduction to monitored quantum systems and quantum trajectories: spectrum, typicality, and phases
Ryusuke Hamazaki, Ken Mochizuki, Hisanori Oshima +1
Thanks to recent experimental advances in simulating and detecting quantum dynamics with high precision and controllability, our understanding of the physics of monitored quantum s…
Topology and Spectrum in Measurement-Induced Phase Transitions
Hisanori Oshima, Ken Mochizuki, Ryusuke Hamazaki +1
Competition among repetitive measurements of noncommuting observables and unitary dynamics can give rise to a wide variety of entanglement phases. Here, we propose a general framew…
Multifractality in monitored single-particle dynamics
Kohei Yajima, Hisanori Oshima, Ken Mochizuki +1
We study multifractal properties in time evolution of a single particle subject to repeated measurements. For quantum systems, we consider circuit models consisting of local unitar…
Floquet Flux Attachment in Cold Atomic Systems
Helia Kamal, Jack Kemp, Yin-Chen He +4
Flux attachment provides a powerful conceptual framework for understanding certain forms of topological order, including most notably the fractional quantum Hall effect. Despite it…
Ground state degeneracy on torus in a family of toric code
Haruki Watanabe, Meng Cheng, Yohei Fuji
Topologically ordered phases in dimensions are generally characterized by three mutually-related features: fractionalized (anyonic) excitations, topological entanglement entr…
Charge fluctuation and charge-resolved entanglement in a monitored quantum circuit with symmetry
Hisanori Oshima, Yohei Fuji
We study a (1+1)-dimensional quantum circuit consisting of Haar-random unitary gates and projective measurements that conserve a total charge and thus have symmetry.…
Bridging three-dimensional coupled-wire models and cellular topological states: Solvable models for topological and fracton orders
Yohei Fuji, Akira Furusaki
Three-dimensional (3D) gapped topological phases with fractional excitations are divided into two subclasses: one has topological order with point-like and loop-like excitations fu…
Bloch oscillations in the spin-1/2 XXZ chain
Yankang Liu, Yohei Fuji, Haruki Watanabe
Under a perfect periodic potential, the electric current density induced by a constant electric field may exhibit nontrivial oscillations, so-called Bloch oscillations, with an amp…
Measurement-induced quantum criticality under continuous monitoring
Yohei Fuji, Yuto Ashida
We investigate entanglement phase transitions from volume-law to area-law entanglement in a quantum many-body state under continuous position measurement on the basis of the quantu…
Anisotropic layer construction of anisotropic fracton models
Yohei Fuji
We propose a coupled-layer construction of a class of fracton topological orders in three spatial dimensions, which is characterized by spatially anisotropic mobility of quasiparti…
From coupled wires to coupled layers: Model with three-dimensional fractional excitations
Yohei Fuji, Akira Furusaki
We propose a systematic approach to constructing microscopic models with fractional excitations in three-dimensional (3D) space. Building blocks are quantum wires described by the…
Quantum Hall hierarchy from coupled wires
Yohei Fuji, Akira Furusaki
The coupled-wire construction provides a useful way to obtain microscopic Hamiltonians for various two-dimensional topological phases, among which fractional quantum Hall states ar…
Non-Abelian SU(N-1)-singlet fractional quantum Hall states from coupled wires
Y. Fuji, P. Lecheminant
The construction of fractional quantum Hall (FQH) states from the two-dimensional array of quantum wires provides a useful way to control strong interactions in microscopic models…
Bridging coupled wires and lattice Hamiltonian for two-component bosonic quantum Hall states
Yohei Fuji, Yin-Chen He, Subhro Bhattacharjee +1
We investigate a model of hard-core bosons with correlated hopping on the honeycomb lattice in an external magnetic field by means of a coupled-wire approach. It has been numerical…
Kagome spin liquid: a deconfined critical phase driven by gauge fluctuation
Yin-Chen He, Yohei Fuji, Subhro Bhattacharjee
We investigate the nature of quantum spin liquid (QSL) phase of the spin- nearest-neighbor XXZ antiferromagnet on the kagome lattice. Recent numerical calculations suggest tha…
Effective field theory for one-dimensional valence-bond-solid phases and their symmetry protection
Yohei Fuji
We investigate valence-bond-solid (VBS) phases in one-dimensional spin systems by an effective field theory developed by Schulz [Phys. Rev. B 34, 6372 (1986)]. While the distinctio…
Distinct trivial phases protected by a point-group symmetry in quantum spin chains
Yohei Fuji, Frank Pollmann, Masaki Oshikawa
The ground state of the antiferromagnetic Heisenberg chain belongs to the Haldane phase -- a well known example of symmetry-protected topological phase. A staggered field app…
Selection of factorizable ground state in a frustrated spin tube: Order by disorder and hidden ferromagnetism
X. Plat, Y. Fuji, S. Capponi +1
The interplay between frustration and quantum fluctuation in magnetic systems is known to be the origin of many exotic states in condensed matter physics. In this paper, we conside…
Quantum criticality in an asymmetric three-leg spin tube: A strong rung-coupling perspective
Yohei Fuji, Satoshi Nishimoto, Hitoshi Nakada +1
We study quantum phase transitions in the asymmetric variation of the three-leg Heisenberg tube for half-odd-integer spin, with a modulation of one of the rung exchange couplings $…
Entanglement spectra between coupled Tomonaga-Luttinger liquids: Applications to ladder systems and topological phases
Rex Lundgren, Yohei Fuji, Shunsuke Furukawa +1
We study the entanglement spectrum (ES) and entropy between two coupled Tomonaga-Luttinger liquids (TLLs) on parallel periodic chains. This problem gives access to the entanglement…
Spin gap of the three-leg S=3/2 Heisenberg tube
S. Nishimoto, Y. Fuji, Y. Ohta
The ground-state properties of the three-leg S=3/2 Heisenberg tube are studied using the density-matrix renormalization group method. We find that the spin-excitation gap associate…