The quantification of a genuine tetrapartite entanglement in a mixed spin-(1/2,1) Heisenberg tetramer

H. Vargová and J. Strečka

Physica A: Statistical Mechanics and its Applications, 2025, vol. 664, issue C

Abstract: The genuine tetrapartite entanglement of a quantum mixed spin-(1/2,1) Heisenberg tetramer is quantified according to the three different approaches incorporated all seven global bisections existing within the tetrapartite system. The degree of an entanglement of each bisection is evaluated through the bipartite negativity at zero- and non-zero temperature taking into account ferromagnetic as well as antiferromagnetic type of intra- (J) and inter-dimer (J1) exchange coupling inside the square plaquette. Three utilized quantification methods based on the generalization of (i) a genuine tripartite negativity, (ii) a Coffman, Kundu and Wootters monogamy relation and (iii) a geometric average of complete trisections, result to the qualitatively and almost quantitatively identical behavior of a genuine tetrapartite negativity. It is shown that the genuine tetrapartite negativity exclusively arises from the antiferromagnetic-inter dimer J1>0 coupling, whereas the character of with respect to J (J>0 or J<0) determines its zero-temperature magnitude as well as its thermal stability with respect to the magnetic field and temperature. As is demonstrated for 0Keywords: Mixed spin-(1/2,1) Heisenberg tetramer; Genuine tetrapartite entanglement; Negativity; Cu2Ni2 molecular complexes (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:664:y:2025:i:c:s0378437125001165

DOI: 10.1016/j.physa.2025.130464

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