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- Title
Thermal entanglement versus quantum-memory-assisted entropic uncertainty relation in a two-qubit Heisenberg system with Herring–Flicker coupling under Dzyaloshinsky–Moriya interaction.
- Authors
Bouafia, Zakaria; Oumennana, Mansoura; Mansour, Mostafa; Ouchni, Fatiha
- Abstract
In our investigation, we delve into the dynamics of thermal entanglement and quantum-memory-assisted entropic uncertainty relation (QMA-EUR) within an XXZ Heisenberg spin-1/2 chain consisting of two qubits. This system is affected by the Herring–Flicker (HF) coupling and exposed to the Dzyaloshinsky–Moriya (DM) interaction, in the presence of an external homogeneous magnetic field. We assume that the system is in thermal equilibrium with a reservoir and examine how various parameters, including the HF coupling distance R, equilibrium temperature, and other system characteristics, affect the logarithmic negativity used to quantify thermal entanglement and QMA-EUR. Our findings reveal intriguing distinctions in the behaviors of QMA-EUR and thermal entanglement. Notably, an increase in temperature is found to effectively reduce thermal entanglement while simultaneously enhancing QMA-EUR. Furthermore, we notice that bipartite entanglement and QMA-EUR exhibit distinct behaviors as we vary the coupling distance, R. Specifically, the logarithmic negativity attains its highest value at a coupling distance of R = 1.25 , which coincides with the lowest QMA-EUR value. Furthermore, we discover that the presence of high-intensity magnetic fields has a detrimental influence on the level of thermal entanglement. However through adjustments in the inter-spins relative distance R, the strength of the DM interaction, temperature T, the anisotropy parameter, and the static magnetic field B, it is possible to suppress the QMA-EUR and enhance bipartite entanglement within the system. These findings suggest encouraging possibilities for advancing quantum technologies that make use of this quantum system.
- Subjects
ENTROPIC uncertainty; QUBITS; THERMAL equilibrium; MAGNETIC fields
- Publication
Applied Physics B: Lasers & Optics, 2024, Vol 130, Issue 6, p1
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-024-08228-7