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This study identifies that in spin-based systems, Bell-CHSH nonlocality degrades at lower temperatures than entanglement or coherence, revealing a specific hierarchy of thermal failure modes. By demonstrating how magnetic anisotropy can stabilize these correlations against abrupt loss, the research provides a pathway for designing more robust quantum hardware with tunable material properties.

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Magnetic Fields Stabilise Quantum Entanglement, Preventing Its Rapid Loss

Quantum Zeitgeist17 iunie 20266 min de cititArticolul și perspectiva sunt în engleză.

Nonlocality, a key feature of quantum entanglement, vanishes first as temperature rises, yet coherence persists, a surprising resilience revealed by new analysis of a two-qubit system. Increasing magnetic anisotropy stabilises entanglement, preventing its abrupt loss and instead promoting a gradual decay. This hierarchy of thermal degradation offers a pathway towards more dependable spin-based quantum technologies through careful control of material properties.

Ahmed Jellal and colleagues at Chouaïb Doukkali Universityy investigate the behaviour of quantum correlations and coherence within a two-qubit anisotropic $XY$ model subjected to a magnetic field. They demonstrate how parameters such as magnetic anisotropy, coupling anisotropy, and temperature influence these quantum resources. Their analysis, utilising quantifiers like concurrence and Bell-CHSH nonlocality, reveals a hierarchy of thermal degradation, with coherence proving the most resilient to fluctuations. The findings offer insights into the tunable control of quantum resources and contribute to the development of strong spin-based quantum technologies Bell-CHSH nonlocality violations, exceeding a value of 2, initially persisted but were fully suppressed by thermal…

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