Results 21 to 30 of about 27,088 (288)
Physical Review Research, 2020 Quantum entanglement is a quantum-mechanical phenomenon where the quantum state of a many-body system with many degrees of freedom cannot be described independently of the state of each body with a given degree of freedom, no matter how far apart in ...
George Mathew +11 more
doaj +2 more sources
Semiclassical Approach to Quantum Fisher Information
Physical Review LettersQuantum sensors driven into the quantum chaotic regime can have dramatically enhanced sensitivity, which, however, depends intricately on the details of the underlying classical phase space.
Schomerus, Henning +2 more
core +4 more sources
Sub-quantum Fisher information [PDF]
Quantum Science and Technology, 2021 Abstract The quantum Fisher information (QFI) plays a crucial role in quantum information theory and in many practical applications such as quantum metrology. However, computing the QFI is generally a computationally demanding task.
M Cerezo +3 more
openaire +2 more sources
Generalized measure of quantum Fisher information [PDF]
Physical Review A, 2021 In this work, we present a lower bound on the quantum Fisher information (QFI) which is efficiently computable on near-term quantum devices. This bound itself is of interest, as we show that it satisfies the canonical criteria of a QFI measure. Specifically, it is essentially a QFI measure for subnormalized states, and hence it generalizes the standard
Akira Sone +3 more
openaire +2 more sources
npj Quantum Information, 2023 We demonstrate that the contextuality of measurement selection can enhance the precision of quantum metrology with a simple linear optical experiment. Contextuality is a nonclassical property known as a resource for various quantum information processing
Jeongwoo Jae +4 more
doaj +2 more sources
Mutual information bounded by Fisher information
Physical Review ResearchWe derive a general upper bound to mutual information in terms of the Fisher information. The bound may be further used to derive a lower bound for the Bayesian quadratic cost. These two provide alternatives to other inequalities in the literature (e.g.,
Wojciech Górecki +3 more
doaj +2 more sources
INTRODUCTION TO QUANTUM FISHER INFORMATION [PDF]
Quantum Probability and Related Topics, 2011 The subject of this paper is a mathematical transition from the Fisher information of classical statistics to the matrix formalism of quantum theory. If the monotonicity is the main requirement, then there are several quantum versions parametrized by a function. In physical applications the minimal is the most popular.
Petz, Denes, Ghinea, Catalin
openaire +2 more sources
Broadcasting quantum Fisher information [PDF]
Physical Review A, 2013 It is well known that classical information can be cloned, but non-orthogonal quantum states cannot be cloned, and non-commuting quantum states cannot be broadcast. We conceive a scenario in which the object we want to broadcast is the statistical distinguishability, as quantified by quantum Fisher information, about a signal parameter encoded in ...
Lu, X.-M. +4 more
openaire +2 more sources
Fisher Information of Free-Electron Landau States
Entropy, 2021 An electron in a constant magnetic field has energy levels, known as the Landau levels. One can obtain the corresponding radial wavefunction of free-electron Landau states in cylindrical polar coordinates.
Takuya Yamano
doaj +1 more source
Quantum Fisher information in noninertial frames [PDF]
Physical Review A, 2014 7 pages, 3 figures. Comments are welcome!
Yao, Yao +4 more
openaire +2 more sources