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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Majorana zero modes in the Kitaev chain protect boundary quantum Fisher information from delocalization, maintaining a nonzero plateau for exponentially long times.
Higher moments of the projected process ensemble reveal entanglement structures that distinguish chaotic from integrable dynamics more sharply than quantum dynamical or spatiotemporal entropies.
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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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Topological protection of local quantum Fisher information
Majorana zero modes in the Kitaev chain protect boundary quantum Fisher information from delocalization, maintaining a nonzero plateau for exponentially long times.
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Diagnosing chaos with projected ensembles of process tensors
Higher moments of the projected process ensemble reveal entanglement structures that distinguish chaotic from integrable dynamics more sharply than quantum dynamical or spatiotemporal entropies.