Results 31 to 40 of about 27,027 (257)
Probing cosmic string spacetime through parameter estimation
European Physical Journal C: Particles and Fields, 2022 Quantum metrology studies the ultimate precision limit of physical quantities by using quantum strategy. In this paper we apply the quantum metrology technologies to the relativistic framework for estimating the deficit angle parameter of cosmic string ...
Ying Yang, Jiliang Jing, Zehua Tian
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Results in Physics, 2023 In post-selection quantum measurement, it is a dilemma to obtain both high precision and large post-selection probability. Here,we deeply examine quantum Fisher information and probability of post-selection quantum measurement based on the trapped ion ...
He-fei Li +6 more
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Covariance and Fisher information in quantum mechanics [PDF]
Journal of Physics A: Mathematical and General, 2002 Variance and Fisher information are ingredients of the Cramer-Rao inequality. We regard Fisher information as a Riemannian metric on a quantum statistical manifold and choose monotonicity under coarse graining as the fundamental property of variance and Fisher information.
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Multipartite entanglement of the topologically ordered state in a perturbed toric code
Physical Review Research, 2022 We demonstrate that multipartite entanglement, witnessed by the quantum Fisher information, can characterize topological quantum phase transitions in the spin-1/2 toric code model (TCM) on a square lattice with external fields.
Yu-Ran Zhang +5 more
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Metrology and multipartite entanglement in measurement-induced phase transition [PDF]
QuantumMeasurement-induced phase transition arises from the competition between a deterministic quantum evolution and a repeated measurement process. We explore the measurement-induced phase transition through the Quantum Fisher Information in two different ...
Giovanni Di Fresco +3 more
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Comment on ‘On the realisation of quantum Fisher information’ [PDF]
European Journal of Physics, 2017 Abstract It is shown that calculation of the momentum Fisher information of the quasi-one-dimensional hydrogen atom recently presented by Saha et al (2017 Eur. J. Phys. 38 025103
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Continuity of the quantum Fisher information [PDF]
Physical Review A, 2019 In estimating an unknown parameter of a quantum state the quantum Fisher information (QFI) is a pivotal quantity, which depends on the state and its derivate with respect to the unknown parameter. We prove the continuity property for the QFI in the sense that two close states with close first derivatives have close QFIs.
Rezakhani, A. T. +3 more
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Fisher information in quantum statistics [PDF]
Journal of Physics A: Mathematical and General, 2000 Braunstein and Caves (1994) proposed to use Helstrom's {\em quantum information} number to define, meaningfully, a metric on the set of all possible states of a given quantum system. They showed that the quantum information is nothing else than the maximal Fisher information in a measurement of the quantum system, maximized over all possible ...
Barndorff-Nielsen, O. E., Gill, R. D.
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Fisher information as a probe of spacetime structure: relativistic quantum metrology in (A)dS
Journal of High Energy Physics, 2021 Relativistic quantum metrology studies the maximal achievable precision for estimating a physical quantity when both quantum and relativistic effects are taken into account.
Haoxing Du, Robert B. Mann
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Operational Interpretation of Quantum Fisher Information in Quantum Thermodynamics
Physical Review Letters, 2022 5 pages+24 pages of Supplementary Material. Some results were previously included in version 1 of arXiv:1805.01989 [quant-ph]
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