For the disordered XXZ chain, the Pauli-basis operator length, computed exactly from MPO marginals, grows logarithmically in the interacting MBL regime and saturates in the Anderson-localized case.
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Operator delocalization in disordered spin chains via exact MPO marginals
For the disordered XXZ chain, the Pauli-basis operator length, computed exactly from MPO marginals, grows logarithmically in the interacting MBL regime and saturates in the Anderson-localized case.