Data di Pubblicazione:
2018
Citazione:
Trade-off between information and disturbance in qubit thermometry / L. Seveso, M.G.A. Paris. - In: PHYSICAL REVIEW A. - ISSN 2469-9926. - 97:3(2018 Mar 28). [10.1103/PhysRevA.97.032129]
Abstract:
We address the trade-off between information and disturbance in qubit thermometry from the perspective of quantum estimation theory. Given a quantum measurement, we quantify information via the Fisher information of the measurement and disturbance via four different figures of merit, which capture different aspects (statistical, thermodynamical, geometrical) of the trade-off. For each disturbance measure, the efficient measurements, i.e., the measurements that introduce a disturbance not greater than any other measurement extracting the same amount of information, are determined explicitly. The family of efficient measurements varies with the choice of the disturbance measure. On the other hand, commutativity between the elements of the probability operator-valued measure (POVM) and the equilibrium state of the thermometer is a necessary condition for efficiency with respect to any figure of disturbance.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Atomic and Molecular Physics, and Optics
Elenco autori:
L. Seveso, M.G.A. Paris
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