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Quantum Information Processing
Erschienen in: Quantum Information Processing 1/2020

01.01.2020

The bounds of Fisher information induced by the superposed input states

verfasst von: Ting-ting Shao, Dong-mo Li, Chang-shui Yu

Erschienen in: Quantum Information Processing | Ausgabe 1/2020

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Abstract

Quantum Fisher information as an important quantity in quantum metrology determines the upper bound of the measurement accuracy. It is shown that the quantum feature such as entanglement can improve quantum Fisher information in some cases. Here we study how quantum coherence affects the quantum Fisher information from a general point of view. We find out that the bounds induced by the superposed states can well restrict the quantum Fisher information in a general parameter estimation scheme. As applications, we demonstrate these bounds by a parameter estimation process with the superposition input state undergoing different quantum channels.
Vorheriger Artikel Quantum speed limit time for correlated quantum channel
Nächster Artikel Triplet q-cat states of the Biedenharn–Macfarlane q-oscillator with q > 1

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Metadaten
Titel
The bounds of Fisher information induced by the superposed input states
verfasst von
Ting-ting Shao
Dong-mo Li
Chang-shui Yu
Publikationsdatum
01.01.2020
Verlag
Springer US
Erschienen in
Quantum Information Processing / Ausgabe 1/2020
Print ISSN: 1570-0755
Elektronische ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-019-2505-1

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