Results 21 to 30 of about 27,027 (257)
Quantum Fisher information in noninertial frames [PDF]
Physical Review A, 2014 7 pages, 3 figures. Comments are welcome!
Yao, Yao +4 more
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Steered quantum coherence and quantum Fisher information in spin-chain system
Results in Physics, 2023 In this paper, we investigate steered quantum coherence, i.e., the l1 norm of steered coherence and the relative entropy of steered coherence, and the quantum Fisher information in the Gibbs state of two-qubit XXZ systems.
Biao-Liang Ye +2 more
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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
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npj Quantum Information, 2022 The quantum Cramér–Rao bound sets a fundamental limit on the accuracy of unbiased parameter estimation in quantum systems, relating the uncertainty in determining a parameter to the inverse of the quantum Fisher information. We experimentally demonstrate
Min Yu +10 more
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Quantum Fisher information with coherence
Optica, 2019 In recent proposals for achieving optical super-resolution, variants of the Quantum Fisher Information (QFI) quantify the attainable precision. We find that claims about a strong enhancement of the resolution resulting from coherence effects are questionable because they refer to very small subsets of the data without proper normalization. When the QFI
Zdeněk Hradil +3 more
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Protecting Quantum Fisher Information in Correlated Quantum Channels [PDF]
Annalen der Physik, 2019 AbstractQuantum Fisher information (QFI) has potential applications in quantum metrology tasks. QFI is investigated when the consecutive actions of a quantum channel on the sequence of qubits have partial classical correlations. The results showed that while the decoherence effect is detrimental to QFI, effects of such classical correlations on QFI are
Ming‐Liang Hu, Hui‐Fang Wang
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Maximal quantum Fisher information matrix
New Journal of Physics, 2017 We study the existence of the maximal quantum Fisher information matrix in the multi-parameter quantum estimation, which bounds the ultimate precision limit.
Yu Chen, Haidong Yuan
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Factorization dynamics between quantum Fisher information and quantum coherence. [PDF]
Sci AdvQuantum Fisher information (QFI) quantifies the sensitivity of a quantum state to a parameter change and plays a key role in quantum metrology. Meanwhile, quantum coherence is a crucial resource for quantum information processing. However, despite extensive studies on various aspects of quantum metrology, the interplay between the dynamics of the QFI ...
Zhao X, Yu X, Li L, Zhou W, Zhang C.
europepmc +3 more sources
From ƒ-Divergence to Quantum Quasi-Entropies and Their Use
Entropy, 2010 Csiszár’s ƒ-divergence of two probability distributions was extended to the quantum case by the author in 1985. In the quantum setting, positive semidefinite matrices are in the place of probability distributions and the quantum generalization is called ...
Dénes Petz
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Fidelity and Fisher information on quantum channels
New Journal of Physics, 2017 The fidelity function for quantum states has been widely used in quantum information science and frequently arises in the quantification of optimal performances for the estimation and distinguishing of quantum states.
Haidong Yuan, Chi-Hang Fred Fung
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