Connecting measurement invasiveness to optimal metrological scenarios

Moreira, Saulo V., Adesso, Gerardo, Correa, Luis A., Coudreau, Thomas, Keller, Arne and Milman, Pérola (2017) Connecting measurement invasiveness to optimal metrological scenarios. Physical Review A, 96 (1). 012110/1-012110/6. ISSN 1094-1622

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The connection between the Leggett-Garg inequality and optimal scenarios from the point of view of quantum metrology is investigated for perfect and noisy general dichotomic measurements. In this context, we show that the Fisher information can be expressed in terms of quantum temporal correlations. This connection allows us to associate scenarios with relatively high Fisher information to scenarios in which the Leggett-Garg inequality is violated. We thus demonstrate a qualitative and, to some extent, quantitative link between measurement invasiveness and metrological performance. Finally, we illustrate our results by using a specific model for spin systems.

Item Type: Article
Additional Information: ©2017 American Physical Society
Keywords: Quantum foundations, Quantum measurements, Quantum metrology
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Mathematical Sciences
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Depositing User: Eprints, Support
Date Deposited: 14 Jul 2017 13:22
Last Modified: 04 May 2020 18:55

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