11 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.…
Krylov Complexity and Mixed-State Phase Transition
Hung-Hsuan Teh, Takahiro Orito
We establish a unified framework connecting decoherence and quantum complexity. By vectorizing the density matrix into a pure state in a double Hilbert space, a decoherence process…
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…
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…
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…
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…