arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.5531quant-ph
收藏

环境模对远程量子系统纠缠的影响

Entanglement of remote quantum systems by environmental modes

Friedemann Queisser, Thomas Zell, Rochus Klesse

摘要:

我们研究了两个局域耦合到公共玻色子浴中的远程振子的量子力学纠缠的产生。从一个合适的模型的拉格朗日公式,我们推导出两个耦合的量子朗之万方程,精确地描述了两个本地振荡器的时间演化的耦合到玻色子浴的存在。数值求解的朗之万方程,使我们能够研究的对数负的时间演化的振荡器之间的纠缠产生。我们的研究结果证实并扩展了我们以前获得的发现,即只有当系统处于微观距离内时,嵌入在自由玻色子浴中的振荡器之间才能实现显着的纠缠。我们还考虑的情况下,玻色子谱密度的大幅修改,通过施加边界条件的浴模式。对于相应的边界条件波导的几何形状的浴,我们发现显着扩大纠缠代。这种现象还说明了一个近似模型,允许分析处理。

英文摘要:

We investigate the generation of quantum mechanical entanglement of two remote oscillators that are locally coupled to a common bosonic bath. Starting with a Lagrangian formulation of a suitable model, we derive two coupled Quantum Langevin Equations that exactly describe the time evolution of the two local oscillators in presence of the coupling to the bosonic bath. Numerically obtained solutions of the Langevin Equations allow us to study the entanglement generation between the oscillators in terms of the time evolution of the logarithmic negativity. Our results confirm and extend our previously obtained findings, namely that significant entanglement between oscillators embedded in a free bosonic bath can only be achieved if the system are within a microscopic distance. We also consider the case where the bosonic spectral density is substantially modified by imposing boundary conditions on the bath modes. For boundary conditions corresponding to a wave-guide like geometry of the bath we find significantly enlarged entanglement generation. This phenomenon is additionally illustrated within an approximative model that allows for an analytical treatment.

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。

↑