Quantum speed limit time and entanglement in a system composed of coupled quantum dots are investigated. The excess electron spin in each quantum dot constitutes the physical system (qubit). Also the spin interaction is modeled through the Heisenberg model and the spins are imposed by an external magnetic field. Taking into account the spin relaxation as a non-Markovian process, the quantum speed limit and entanglement evolution are discussed. Our findings reveal that increasing the magnetic field leads to the faster quantum evolution. In addition, the temperature increment causes the longer quantum speed limit time as well as the entanglement degradation.

中文翻译：

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耦合量子点的自旋量子比特的非马尔可夫演化中的量子速度限制时间和纠缠

研究了由耦合量子点组成的系统中的量子限速时间和纠缠。每个量子点中多余的电子自旋构成了物理系统（量子位）。此外，自旋相互作用是通过海森堡模型建模的，并且自旋是由外部磁场施加的。考虑到作为非马尔可夫过程的自旋弛豫，讨论了量子速度极限和纠缠演化。我们的研究结果表明，增加磁场会导致更快的量子演化。此外，温度升高导致量子限速时间延长以及纠缠退化。