125 citations · 1.3k across the 105 of their papers we have counts for
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Microscopic study of topological phase transitions: Percolation point of view
Keisuke Kataoka, Ikuo Ichinose
We investigate microscopic mechanisms underlying decoherence-induced transitions between topologically ordered states. As a first case study, we analyze the color code using topolo…
Decohered color code and emerging mixed toric code by anyon proliferation: Topological entanglement negativity perspective
Keisuke Kataoka, Yoshihito Kuno, Takahiro Orito +1
We study how the color code under decoherence gives rise to an intrinsic mixed-state topological order (imTO), which has no counterpart in pure ground states of local gapped Hamilt…
Mixed-state phase structure of gauge-Higgs subsystem codes under logical-preserving decoherence
Yoshihito Kuno, Ikuo Ichinose
Some of lattice-gauge-theory models, in particular gauge-Higgs model (GHM), can be regarded and work as a subsystem code. This work studies the effect of local-gauge-symmetric deco…
Measurement-only circuit of perturbed toric code on triangular lattice: Topological entanglement, 1-form symmetry and logical qubits
Keisuke Kataoka, Yoshihito Kuno, Takahiro Orito +1
Measurement-only (quantum) circuit (MoC) gives possibility to realize the states with rich entanglements, topological orders and quantum memories. This work studies the MoC, in whi…
Succession of Ising criticality and its threshold in critical quantum Ising model subject to symmetric decoherence
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
We investigate a mixed state quantum criticality in the Ising model under decoherence. In the doubled Hilbert space formalism, the decohered state resides on the self-dual c…
Rényi and Shannon mutual information in critical and decohered critical system
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
We investigate a critical many-body system by introducing a Rényi generalized mutual information, connecting between Rényi mutual information and Rényi Shannon mutual information.…
Rényi Markov length in one-dimensional non-trivial mixed state phases and mixed state phase transitions
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Discovering and classifying non-trivial mixed states and mixed state phase transitions are some of the most important current issues in condensed matter and quantum information. In…
Strong-to-weak spontaneous symmetry breaking and average symmetry protected topological order in the doubled Hilbert space
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Discovering and categorizing quantum orders in mixed many-body systems are currently one of the most important problems. Target model in this study is an extended version of the cl…
Strong and weak symmetries and their spontaneous symmetry breaking in mixed states emerging from the quantum Ising model under multiple decoherence
Takahiro Orito, Yoshihito Kuno, Ikuo Ichinose
Discovering and categorizing quantum orders in mixed many-body systems are currently one of the most important problems. Specific types of decoherence applied to typical quantum ma…
System-environmental entanglement in critical spin systems under -decoherence and its relation to strong and weak symmetries
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Open quantum many-body systems exhibit nontrivial behavior under decoherence. In particular, system-environmental entanglement (SEE) is one of the efficient quantities for classify…
Intrinsic mixed state topological order in a stabilizer system under stochastic decoherence: Strong-to-weak spontaneous symmetry breaking from percolation point of view
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Discovering quantum orders in mixed many-body systems is an ongoing issue. Very recently, the notion of an intrinsic mixed state topologically-ordered (IMTO) state was proposed. As…
Strong-to-weak symmetry breaking states in stochastic dephasing stabilizer circuits
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Discovering mixed state quantum orders is an on-going issue. Recently, it has been recognized that there are (at least) two kinds of symmetries in the mixed state; strong and weak…
Measurement-only dynamical phase transition of topological and boundary order in toric code and gauge-Higgs models
Takahiro Orito, Yoshihito Kuno, Ikuo Ichinose
We extensively study long-time dynamics and fate of topologically-ordered state in toric code model evolving through projective measurement-only circuit. The circuit is composed of…
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…
Atomic Quantum Simulation of Lattice Gauge-Higgs Model: Higgs Couplings and Emergence of Exact Local Gauge Symmetry
Kenichi Kasamatsu, Ikuo Ichinose, Tetsuo Matsui
Recently, the possibility of quantum simulation of dynamical gauge fields was pointed out by using a system of cold atoms trapped on each link in an optical lattice. However, to im…
Phase Structure of the Random-Plaquette Z_2 Gauge Model: Accuracy Threshold for a Toric Quantum Memory
Takuya Ohno, Gaku Arakawa, Ikuo Ichinose +1
We study the phase structure of the random-plaquette Z_2 lattice gauge model in three dimensions. In this model, the "gauge coupling" for each plaquette is a quenched random variab…
Z_N Gauge Theories on a Lattice and Quantum Memory
Gaku Arakawa, Ikuo Ichinose
In the present paper we shall study (2+1) dimensional Z_N gauge theories on a lattice. It is shown that the gauge theories have two phases, one is a Higgs phase and the other is a…