The Link between Fisher Information and Geometric Discord

A. Lowe; I. V. Yurkevich

The Link between Fisher Information and Geometric Discord

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

By considering an arbitrary two-qubit state, it is shown that the Fisher information is intrinsically linked to the geometric discord which allows a measure for quantum correlations beyond entanglement. The complex amplitude of oscillations of the probability density function is upper bounded by the geometric discord which subsequently results in the Fisher information being bounded by the geometric discord. This gives an experimental observable which can be used to quantify quantum correlations beyond entanglement. This observable can be used to witness quantum correlations in an interferometry experiment, and provide another avenue for quantum technologies to continue to develop.

Original language	English
Pages (from-to)	445-449
Number of pages	5
Journal	Fizika Nizkikh Temperatur
Volume	48
Issue number	5
Publication status	Published - 31 May 2022

Keywords

Fisher information
quantum correlations
quantum discord

Cite this

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AB - By considering an arbitrary two-qubit state, it is shown that the Fisher information is intrinsically linked to the geometric discord which allows a measure for quantum correlations beyond entanglement. The complex amplitude of oscillations of the probability density function is upper bounded by the geometric discord which subsequently results in the Fisher information being bounded by the geometric discord. This gives an experimental observable which can be used to quantify quantum correlations beyond entanglement. This observable can be used to witness quantum correlations in an interferometry experiment, and provide another avenue for quantum technologies to continue to develop.

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The Link between Fisher Information and Geometric Discord

Abstract

Keywords

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The link between Fisher information and geometric discord

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