Aspects of quantum states asymmetry for the magnetic dipolar interaction dynamics

Pinto, Douglas F.; Maziero, Jonas

doi:10.1007/s11128-021-03318-3

Cited by 2 publications

(2 citation statements)

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“…Among these are Heisenberg exchange, which is isotropic under rotations in spin space [4,6,20,21], and Dzyaloshinskii-Moriya (DM) interaction [32][33][34], which accounts for weak ferromagnetism in some antiferromagnetic materials [12]. A ubiquitous example of anisotropic coupling in LDMCs is the dipolar interaction [17,[27][28][29][30][31]. This coupling arises from the influence of a magnetic field yielded by one of the magnetic moments in the other ones [12].…”

Section: Dinuclear Metal Complex With Dipolar Interactionmentioning

confidence: 99%

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Geometric quantum discord and coherence in a dipolar interacting magnetic system

et al. 2023

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The study of low-dimensional metal complexes has revealed fascinating characteristics regarding the ground-state crossover shown by spin-gaped systems. In this context, this work explores the effect of the quantum-level crossing, induced by the magnetic anisotropies of dipolar interaction, on the quantum discord and coherence of a dinuclear spin-1/2 system. The analytical expressions for the quantum discord, based on Schatten 1-norm, and the $l_1$ {norm} quantum coherence for dinuclear spin-1/2 systems, are provided in terms of the magnetic anisotropies. The results show that, while the quantum discord has a clear signature of the quantum level-crossing, the basis dependence of the axial quantum coherence hides the crossover regarding the measured basis. Moreover, global coherence was expressed in terms of the co-latitude and longitude angles of the Bloch sphere representation. Through this result, the average quantum coherence is numerically measured in order to obtain a basis-independent perspective for the $l_1$ quantum coherence. The results show that the average measurement revealed the signature of the energy-level crossover obtained in the measurement of quantum discord, being wholly stored within the correlations of the system, even in the absence of entanglement.

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Section: Dinuclear Metal Complex With Dipolar Interactionmentioning

confidence: 99%

“…These characteristics make these systems promising platforms for the development of emerging quantum technologies [4,[23][24][25][26]. In regard to these possible applications, the study of dipolar interacting magnetic systems has received considerable attention in the quantum information literature [17,[27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Geometric quantum discord and coherence in a dipolar interacting magnetic system

et al. 2023

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Parity symmetry breaking of spin-j coherent state superpositions in Gaussian noise channel

El Alaoui,

Slaoui,

Lakhfif

et al. 2024

Phys. Scr.

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The Wigner function and Wigner-Yanase skew information are connected through quantum coherence. States with high skew information often exhibit more pronounced negative regions in their Wigner functions, indicative of quantum interference and non-classical behavior. Thus, the relationship between these two concepts is that states with high quantum coherence tend to display more non-classical features in their Wigner functions. By exploiting this relationship, which manifests as parity symmetry and asymmetry, we analyze parity symmetry and asymmetry in the superposition of two spin coherent states for a spin-$1/2$, as well as for a general spin-$j$. This analysis shows that the preservation of the parity asymmetry, or the violation of the parity symmetry, correlates with an increase in the value of spin $j$. Additionally, we investigate the behavior of parity symmetry and asymmetry of these states subjected to a Gaussian noise channel. Specifically, we examine how this parity symmetry and asymmetry change and identify the points at which parity symmetry is violated in the spin-$1/2$ cat state. Notably, the violation of parity symmetry becomes more pronounced at higher values of the decoherence parameter $s$. Our study shows how the spin value $j$ affects the breaking of parity symmetry in general spin-$j$ cat states that are hit by Gaussian noise.

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Aspects of quantum states asymmetry for the magnetic dipolar interaction dynamics

Cited by 2 publications

References 50 publications

Geometric quantum discord and coherence in a dipolar interacting magnetic system

Geometric quantum discord and coherence in a dipolar interacting magnetic system

Parity symmetry breaking of spin-j coherent state superpositions in Gaussian noise channel

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