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arXiv 0808.0675quant-ph
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开放量子系统中的渐近纠缠

Asymptotic entanglement in open quantum systems

Aurelian Isar

摘要:

在基于完全正量子动力学半群的开放系统理论框架下,我们在渐近长时间区域求解了两个独立谐振子与环境相互作用的主方程.我们给出了一个描述的连续变量渐近纠缠的协方差矩阵的考虑子系统的任意高斯输入状态。利用Peres-Simon双模高斯态可分离的充分必要条件,证明了对于某些环境,初始态渐近演化为纠缠平衡二分态,而对于其他描述环境的系数值,渐近态是可分离的.我们还计算了表征渐近态纠缠度的对数负性。

英文摘要:

In the framework of the theory of open systems based on completely positive quantum dynamical semigroups, we solve in the asymptotic long-time regime the master equation for two independent harmonic oscillators interacting with an environment. We give a description of the continuous-variable asymptotic entanglement in terms of the covariance matrix of the considered subsystem for an arbitrary Gaussian input state. Using Peres--Simon necessary and sufficient condition for separability of two-mode Gaussian states, we show that for certain classes of environments the initial state evolves asymptotically to an entangled equilibrium bipartite state, while for other values of the coefficients describing the environment, the asymptotic state is separable. We calculate also the logarithmic negativity characterizing the degree of entanglement of the asymptotic state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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