A Monte Carlo method maps quantum Fisher information lower bounds for explicit many-body wavefunctions to classical expectation values, enabling efficient computation under decoherence for Jastrow-Gutzwiller states.
Assembling Extensive Quantum Fisher Information in Stabilizer Systems
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abstract
We introduce a systematic framework to construct nonlocal observables with extensive quantum Fisher information (QFI) density in stabilizer codes. The construction maps stabilizer generators to dual Ising spins whose correlators equal string order parameters, converting hidden nonlocal order into a metrologically accessible observable. Applying this to monitored cluster codes and the toric code, we identify transitions in the QFI scaling from an extensive regime, where long-range string order prevails, to an intensive one driven by competing single-site measurements.
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quant-ph 1years
2026 1verdicts
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Quantum Fisher Information under decoherence with explicit wavefunctions
A Monte Carlo method maps quantum Fisher information lower bounds for explicit many-body wavefunctions to classical expectation values, enabling efficient computation under decoherence for Jastrow-Gutzwiller states.