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<p>In this work, we investigate the behavior of quantum coherence and non-classical correlations in a system of two qubits confined in semiconductor quantum dots, coupled via dipole–dipole interactions and influenced by both an external electric field and Dzyaloshinskii–Moriya (DM) interaction. We explore the behavior of coherence, entanglement (quantified via logarithmic negativity), and local quantum Fisher information (LQFI) under varying physical parameters such as temperature, dipolar coupling strength, and the DM interaction parameter. Our results reveal that quantum coherence and entanglement are significantly affected by thermal fluctuations and interaction strengths. Notably, both coherence and entanglement decay with increasing temperature, but exhibit enhanced robustness with stronger dipolar and DM couplings. Moreover, the persistence of LQFI in regimes where entanglement vanishes demonstrates the existence of quantum correlations beyond entanglement, with the DM interaction playing a crucial role in maintaining these correlations under adverse conditions.</p>

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Dipolar Interaction Effects on Non-classical Correlations in the Quantum Dots Qubits Model with DM Interaction

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • R. Chkaifa,
  • H. Mhamdi,
  • N. Habiballah,
  • M. Daoud,
  • B. Maroufi

摘要

In this work, we investigate the behavior of quantum coherence and non-classical correlations in a system of two qubits confined in semiconductor quantum dots, coupled via dipole–dipole interactions and influenced by both an external electric field and Dzyaloshinskii–Moriya (DM) interaction. We explore the behavior of coherence, entanglement (quantified via logarithmic negativity), and local quantum Fisher information (LQFI) under varying physical parameters such as temperature, dipolar coupling strength, and the DM interaction parameter. Our results reveal that quantum coherence and entanglement are significantly affected by thermal fluctuations and interaction strengths. Notably, both coherence and entanglement decay with increasing temperature, but exhibit enhanced robustness with stronger dipolar and DM couplings. Moreover, the persistence of LQFI in regimes where entanglement vanishes demonstrates the existence of quantum correlations beyond entanglement, with the DM interaction playing a crucial role in maintaining these correlations under adverse conditions.