非马尔科夫耗散条件下制备多体量子纠缠态的研究

The decoherence induced from dissipation of the environments is one of the important limiting factors to the quantum information precesses. However, the dissipation of the environments destroys the entanglement among the systems, it can also provide one quantum channel to induce entangement for the systemes with no directly interations simultaneously. Based on this fact, we investigate the generation of multipartite entanglement under non-Markovian dissipative environment. The influences of non-Markovian effect, atomic dipole-dipole interactions, coupling strength and environmental temperature on entanglement generation will be considered. We will show how to prepare the highly entangled multipartite quantum states with the assitance of detuning modulation and classical driving fields. Then, we will give a physical interpretation via quasimode or pesudomode theories. Our research has an active influence on the realization of quantum information processes which are based on multipartite entanglement.

环境耗散诱导退相干是实现量子信息处理的主要限制因素之一。然而，环境耗散在破坏量子系统间纠缠的同时，也可以为那些没有直接相互作用的系统提供一个量子通道，从而诱导这些系统之间纠缠的形成。基于此原理，本项目研究非马尔科夫耗散条件下多体量子纠缠态的制备。考虑非马尔科夫效应、原子偶极-偶极相互作用、系统与环境的耦合强度和环境温度等参数对纠缠产生的影响，利用失谐调制技术和经典驱动场技术辅助制备非马尔科夫耗散环境下高度纠缠的多体量子态。然后，利用准模或赝模理论对结果进行合理解释。本课题的研究对实现以多体纠缠为主要资源的量子信息处理有着积极的意义。

研究了非马尔科夫耗散条件下的多体量子纠缠态制备，发现通过调整系统与非马尔科夫库间的失谐可以有效地诱导更高纠缠度的多体量子纠缠态。该方案对系统与环境间的非对称耦合具有极强的鲁棒性。此外，还发现非马尔科夫效应与失谐的共同作用还可以用来稳定开放量子系统的几何相。这说明，几何相不仅仅在马尔科夫噪声下有较好的容错性，而且在非马尔科夫噪声下，只要引入失谐调控，仍然可以使其保持良好的容错性。考虑到制备好的纠缠在实际量子系统中仍会受到环境影响而衰减，我们提出了利用量子弱测量和弱测量反转的方法来恢复量子系统间纠缠的理论方案，并且与当前的实验技术手段结合讨论了这些方案的可行性。