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<p>This research investigates the role of quantum discord and classical correlation of two-coupled double quantum dots (DQDs). We have established a relationship between the centrosymmetric (CS) and X matrices through a local orthogonal transformation. Furthermore, we have derived analytical expressions for the mutual information, quantum and classical parts of correlations of the physical system via the local orthogonal transformation. The effects of the tunneling parameters, the Coulomb interaction, and the temperature on the quantum discord (QD) and the entanglement of formation (EoF) are studied in detail. Furthermore, it is found that the Coulomb interactions between electrons and the strength of tunneling rates inside each quantum molecule significantly affect the variations of quantum discord, EoF and geometric quantum discord (GQD). The trace norm geometric quantum discord (one-norm GQD) is more robust than both Hilbert-Schmidt norm GQD (two-norm GQD) and QD for the system. Our results provide insights into the quantum correlations and reveal some significant findings for the development of quantum technologies.</p>

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Quantum discord and classical correlation in two coupled double quantum dots system

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Hao Wang

摘要

This research investigates the role of quantum discord and classical correlation of two-coupled double quantum dots (DQDs). We have established a relationship between the centrosymmetric (CS) and X matrices through a local orthogonal transformation. Furthermore, we have derived analytical expressions for the mutual information, quantum and classical parts of correlations of the physical system via the local orthogonal transformation. The effects of the tunneling parameters, the Coulomb interaction, and the temperature on the quantum discord (QD) and the entanglement of formation (EoF) are studied in detail. Furthermore, it is found that the Coulomb interactions between electrons and the strength of tunneling rates inside each quantum molecule significantly affect the variations of quantum discord, EoF and geometric quantum discord (GQD). The trace norm geometric quantum discord (one-norm GQD) is more robust than both Hilbert-Schmidt norm GQD (two-norm GQD) and QD for the system. Our results provide insights into the quantum correlations and reveal some significant findings for the development of quantum technologies.