Results 31 to 40 of about 27,088 (288)
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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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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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.
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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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A Fisher Information-Based Incompatibility Criterion for Quantum Channels
, 2022 International audienceWe introduce a new incompatibility criterion for quantum channels based on the notion of (quantum) Fisher information. Our construction is based on a similar criterion for quantum measurements put forward by H. Zhu.
Zhang, Qing-Hua +3 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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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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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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Critical parametric quantum sensing
, 2023 Critical quantum systems are a promising resource for quantum metrology applications, due to the diverging susceptibility developed in proximity of phase transitions.
Minganti, F. +6 more
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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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