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Grant support

The authors thank the Madrid regional government, Comunidad Autonoma de Madrid, for the project Quantum Information Technologies (Project No. QUITEMAD-CM P2018/TCS-4342). The work of L.R. was supported by Spanish Ministry of Economy and Competitiveness Grant No. PGC2018-094583-B-I00.

Analysis of institutional authors

Faba, JCorresponding AuthorMartin, VAuthorRobledo, LAuthor

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May 24, 2021
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Article

Two-orbital quantum discord in fermion systems

Publicated to:Physical Review a. 103 (3): 32426- - 2021-03-19 103(3), DOI: 10.1103/PhysRevA.103.032426

Authors: Faba, Javier; Martin, Vicente; Robledo, Luis;

Affiliations

Univ Autonoma Madrid, CIAFF, Madrid 28049, Spain - Author
Univ Autonoma Madrid, Dept Fis Teor, Madrid 28049, Spain - Author
Univ Politecn Madrid, Ctr Computat Simulat, Campus Montegancedo, Madrid 28660, Spain - Author

Abstract

A simple expression to compute the quantum discord between two orbitals in fermion systems is derived using the parity superselection rule. As the correlation between orbitals depends on the basis chosen, we discuss a special orbital basis, the natural one. We show that quantum correlations between natural orbital pairs disappear when the pairing tensor is zero, i.e., the particle number symmetry is preserved. The Hartree-Fock orbitals within a Slater determinant state, Hartree-Fock-Bogoliubov quasiparticle orbitals in a quasiparticle vacuum, or the ground state of a Hamiltonian with particle symmetry and their corresponding natural orbitals are some relevant examples of natural bases and their corresponding states. Since natural orbitals have that special property, we seek the quantum discord in non-natural orbital bases. We analyze our findings in the context of the Lipkin-Meshkov-Glick and Agassi models.

Keywords

ApproximationEntanglementInformationValidity

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Physical Review a due to its progression and the good impact it has achieved in recent years, according to the agency Scopus (SJR), it has become a reference in its field. In the year of publication of the work, 2021, it was in position , thus managing to position itself as a Q1 (Primer Cuartil), in the category Atomic and Molecular Physics, and Optics.

From a relative perspective, and based on the normalized impact indicator calculated from World Citations from Scopus Elsevier, it yields a value for the Field-Weighted Citation Impact from the Scopus agency: 1.12, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: ESI Nov 14, 2024)

This information is reinforced by other indicators of the same type, which, although dynamic over time and dependent on the set of average global citations at the time of their calculation, consistently position the work at some point among the top 50% most cited in its field:

  • Field Citation Ratio (FCR) from Dimensions: 6.03 (source consulted: Dimensions Jul 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-07-06, the following number of citations:

  • WoS: 5
  • Scopus: 16

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-07-06:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 6.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 6 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 0.25.
  • The number of mentions on the social network X (formerly Twitter): 1 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.

Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (FABA GARCIA, JAVIER) and Last Author (ROBLEDO MARTIN, LUIS MIGUEL).

the author responsible for correspondence tasks has been FABA GARCIA, JAVIER.