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Properties of quantum coherence and correlations in quasi-entangled coherent states

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Abstract

We investigate the validity of quantum Fisher information (QFI) as a helpful coherence quantifier by drawing a comparison with first-order coherence (FOC) and some other relevant quantifiers to study the coherence and correlations in the quasi-Werner entangled coherent states (quasi-WECS). We identify QFI as a more useful coherence quantifier as it quantifies coherences of individual subsystems and correlations between them. On the other hand, FOC identifies coherences present in the individual subsystems only. Our results show that all of these coherence quantifiers follow the same behavior toward their maximum (or minimum) values for experimentally achievable values of the mean photon number.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: This is totally theoretical and no experimental data is available.].

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Authors and Affiliations

  1. Quaid-i-Azam University, Islamabad, 45320, Pakistan

    Asad Ali, Mustansar Nadeem & A. H. Toor

  2. FUUAST Islamabad, Islamabad, Pakistan

    Mustansar Nadeem

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  1. Asad Ali
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Correspondence to Asad Ali.

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Ali, A., Nadeem, M. & Toor, A.H. Properties of quantum coherence and correlations in quasi-entangled coherent states. Eur. Phys. J. D 75, 266 (2021). https://doi.org/10.1140/epjd/s10053-021-00267-5

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