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A pedagogical intrinsic approach to relative entropies as potential functions of quantum metrics: Theq–zfamily
KTH, School of Engineering Sciences (SCI), Engineering Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-2153-9630
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2018 (English)In: Annals of Physics, ISSN 0003-4916, E-ISSN 1096-035X, Vol. 395, p. 238-274Article in journal (Refereed) Published
Abstract [en]

The so-called q-z-Rényi Relative Entropies provide a huge two parameter family of relative entropies which include almost all well-known examples of quantum relative entropies for suitable values of the parameters. In this paper we consider a log-regularized version of this family and use it as a family of potential functions to generate covariant (0,2) symmetric tensors on the space of invertible quantum states in finite dimensions. The geometric formalism developed here allows us to obtain the explicit expressions of such tensor fields in terms of a basis of globally defined differential forms on a suitable unfolding space without the need to introduce a specific set of coordinates. To make the reader acquainted with the intrinsic formalism introduced, we first perform the computation for the qubit case, and then, we extend the computation of the metric-like tensors to a generic n-level system. By suitably varying the parameters q and z, we are able to recover well-known examples of quantum metric tensors that, in our treatment, appear written in terms of globally defined geometrical objects that do not depend on the coordinates system used. In particular, we obtain a coordinate-free expression for the von Neumann–Umegaki metric, for the Bures metric and for the Wigner–Yanase metric in the arbitrary n-level case.

Place, publisher, year, edition, pages
Elsevier BV , 2018. Vol. 395, p. 238-274
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Physical Sciences
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URN: urn:nbn:se:kth:diva-358072DOI: 10.1016/j.aop.2018.05.015ISI: 000442061000016Scopus ID: 2-s2.0-85048723780OAI: oai:DiVA.org:kth-358072DiVA, id: diva2:1924492
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QC 20250107

Available from: 2025-01-06 Created: 2025-01-06 Last updated: 2025-01-07Bibliographically approved

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Laudato, Marco

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  • apa
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