In a U(1)-broken XX spin chain the local quantum Fisher information shows no first-order depletion in the transverse field and drops at second order via two-magnon scattering, while a single-qubit decoder cannot recover the full block QFI due to subspace compression.
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Leggett-Garg inequality violations yield lower bounds on quantum Fisher information in stationary pure and thermal states, serving as a witness for many-body quantum coherence.
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Operator spreading and recoverability of local quantum Fisher information in a $U(1)$-broken spin chain
In a U(1)-broken XX spin chain the local quantum Fisher information shows no first-order depletion in the transverse field and drops at second order via two-magnon scattering, while a single-qubit decoder cannot recover the full block QFI due to subspace compression.
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Leggett-Garg Inequality Violations Bound Quantum Fisher Information
Leggett-Garg inequality violations yield lower bounds on quantum Fisher information in stationary pure and thermal states, serving as a witness for many-body quantum coherence.