标题： 开放系统中的纠缠和纯度：林德布拉德方法的失效 显示英文标题

标题： Entanglement and Purity in Open Systems: A Breakdown of the Lindblad Approach

摘要： 我们研究了Lindblad主方程在捕捉开放量子系统中纠缠和纯度的短时动力学方面的有效性。 专注于两个相互作用的两能级系统与更大环境相互作用，我们将Lindbladian方法与完整的微观处理进行比较。 虽然后者显示出纠缠增长和纯度的二次衰减，但Lindbladian方法预测纯度线性衰减，并且当耗散耦合超过相互作用强度时可以完全抑制纠缠。 引入时间依赖的Lindbladian改进了一些预测，但在其他可观测量中导致不一致。 我们的结果突显了有效模型的局限性，并强调在描述微妙的量子行为时需要谨慎。 显示英文摘要

摘要： We examine the effectiveness of Lindblad master equation in capturing the short-time dynamics of entanglement and purity in open quantum systems. Focusing on two interacting two-level systems interacting with a larger environment, we compare the Lindbladian approach to a full microscopic treatment. While the latter shows entanglement growth and a quadratic decay of purity, the Lindbladian method predicts a linear purity decay and can entirely suppress entanglement when the dissipative coupling exceeds the interaction strength. Introducing a time-dependent Lindbladian improves some predictions but causes inconsistencies in other observables. Our results highlight the limitations of effective models and the need for caution when applying them to describe subtle quantum behaviors.