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Edge bits in average symmetry protected topological mixed state
Yoshihito Kuno
Edge bit in an average symmetry protected topological (ASPT) mixed state is studied. The state is protected by one strong and one weak (average) symmetries. As analogou…
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 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…
Disordered purification phase transition in hybrid random circuits
Kengo Anzai, Hiroaki Matsueda, Yoshihito Kuno
Noise is inevitable in realistic quantum circuits. It arises randomly in space. Inspired by spatial non-uniformity of the noise, we investigate the effects of spatial modulation on…
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…
Topological pump and its plateau transitions of -leg spin ladder
Kota Yamamoto, Yoshihito Kuno, Tomonari Mizoguchi +2
A topological pump on an leg spin ladder is discussed by introducing spatial clusterization whose adiabatic limit is a set of site staircase clusters. We…
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…