16 papers
Hierarchy of mixed symmetry protected topological states in extended cluster states under subsystem decoherence
Yoshihito Kuno, Takahiro Orito
We study the effect of subsystem decoherence to an extended cluster state which is a symmetry protected topological (SPT) phase. The model includes many subsystem symmetries.…
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…
Continuous Reset-Induced Phase Transition in Measurement-Free Random Quantum Circuits
Hinata Yokoyama, Kengo Anzai, Dina Syverud-Lindland +2
We study a random unitary quantum circuit with only reset channels, which has high feasibility for real quantum devices. In particular, we investigate the many-body statistical phy…
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…
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…