Results 41 to 50 of about 142,025 (180)
Ancilla-induced amplification of quantum Fisher information [PDF]
The European Physical Journal Plus, 2018 Given a quantum state with an unknown parameter, the Quantum Fisher Information (QFI) is a measure of the amount of information that an observable can extract about the parameter. QFI also quantifies the maximum achievable precision in estimating the parameter with a given amount of resource via an inequality known as quantum Cramer-Rao bound.
C. S. Sudheer Kumar, T. S. Mahesh
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Super-Heisenberg scaling in Hamiltonian parameter estimation in the long-range Kitaev chain
Physical Review Research, 2022 In quantum metrology, nonlinear many-body interactions can enhance the precision of Hamiltonian parameter estimation to surpass the Heisenberg scaling.
Jing Yang +3 more
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Maximal Quantum Fisher Information for Mixed States [PDF]
Physical Review Letters, 2019 We study quantum metrology for unitary dynamics. Analytic solutions are given for both the optimal unitary state preparation starting from an arbitrary mixed state and the corresponding optimal measurement precision. This represents a rigorous generalization of known results for optimal initial states and upper bounds on measurement precision which can
Fiderer, Lukas J. +2 more
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Quantum nonunital dynamics of spin-bath-assisted Fisher information
AIP Advances, 2016 The nonunital non-Markovian dynamics of qubits immersed in a spin bath is studied without any Markovian approximation. The environmental effects on the precisions of quantum parameter estimation are taken into account.
Xiang Hao, Yinzhong Wu
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Quantum Covariance, Quantum Fisher Information, and the Uncertainty Relations [PDF]
IEEE Transactions on Information Theory, 2009 In this paper, the relation between quantum covariances and quantum Fisher informations is studied. This study is applied to generalize a recently proved uncertainty relation based on quantum Fisher information. The proof given here considerably simplifies the previously proposed proofs and leads to more general inequalities.
GIBILISCO, PAOLO, Hiai, F, Petz, D.
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Hierarchy of measurement-induced Fisher information for composite states
, 2012 Quantum Fisher information, as an intrinsic quantity for quantum states, is a central concept in quantum detection and estimation. When quantum measurements are performed on quantum states, classical probability distributions arise, which in turn lead to
A. S. Holevo +8 more
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Quantum fisher information transfer and distribution in a hierarchical environment
Results in PhysicsHow quantum information encoded into a quantum state is lost, or transferred when an interest quantum system is coupled to its environment, is a fundamental issue in quantum information processing.
Youneng Guo, Qinglong Tian
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Fisher information and asymptotic normality in system identification for quantum Markov chains
, 2011 This paper deals with the problem of estimating the coupling constant $\theta$ of a mixing quantum Markov chain. For a repeated measurement on the chain's output we show that the outcomes' time average has an asymptotically normal (Gaussian) distribution,
A. S. Holevo +10 more
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Continuous-variable phase-estimation with unitary and random linear disturbance [PDF]
, 2014 We address the problem of continuous-variable quantum phase estimation in the presence of linear disturbance at the Hamiltonian level, by means of Gaussian probe states.
de Souza, Douglas Delgado +2 more
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Scientific Reports, 2023 Thermomagnetic properties, and its effects on Fisher information entropy with Schioberg plus Manning-Rosen potential are studied using NUFA and SUSYQM methods in the presence of the Greene-Aldrich approximation scheme to the centrifugal term.
I. B. Okon +14 more
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