Under combined ZZ and X decoherence, the ground state of the transverse-field Ising chain becomes a mixed state whose phase diagram, revealed by Rényi-2 correlators and entanglement entropy, matches the quantum Ashkin-Teller model and includes a strong-to-weak Z2 symmetry-breaking phase.
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Strong and weak symmetries and their spontaneous symmetry breaking in mixed states emerging from the quantum Ising model under multiple decoherence
Under combined ZZ and X decoherence, the ground state of the transverse-field Ising chain becomes a mixed state whose phase diagram, revealed by Rényi-2 correlators and entanglement entropy, matches the quantum Ashkin-Teller model and includes a strong-to-weak Z2 symmetry-breaking phase.