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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Optimal initial states for non-equilibrium quantum thermometry exhibit the quantum Mpemba effect and thermalize faster than most states in Markovian models.
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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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Quantum Mpemba Effect in Non-Equilibrium Quantum Thermometry
Optimal initial states for non-equilibrium quantum thermometry exhibit the quantum Mpemba effect and thermalize faster than most states in Markovian models.