August 21, 2024PRX QuantumOpen Access

Robust Estimation of the Quantum Fisher Information on a Quantum Processor

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The quantum fisher information was successfully estimated, indicating genuine multipartite entanglement and its potential in metrology.
Using randomized measurement methods, the team maintained robust estimators against errors during the measurement protocol.
Assessment involved preparing the transverse-field Ising model's ground state at the critical point, with a focus on circuit optimization effects on noise levels in calculations of QFI and its interpretations across different setups. This provides insights into relevant measurement intricacies.

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Experimental measurement estimates quantum fisher information in Greenberger-Horne-Zeilinger states, suggesting implications for metrology.

Vitale et al. (2024) studied this question.

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Experimental measurement estimates quantum fisher information in Greenberger-Horne-Zeilinger states, suggesting implications for metrology.