arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1506.08293quant-ph
收藏

利用环境耦合实现非马尔可夫量子存储

Harnessing non-Markovian quantum memory by environmental coupling

Zhong-Xiao Man, Yun-Jie Xia, Rosario Lo Franco

摘要:

控制开放量子系统的非马尔可夫动力学在量子信息技术中至关重要,因为它在保存量子记忆方面发挥着至关重要的作用。尽管在许多现实场景中,量子系统可以同时与复合环境相互作用,但这种情况仍然很少被理解,特别是关于环境部分之间耦合的影响。我们分析了一个量子比特同时与两个耦合的单模腔相互作用的非马尔可夫行为,这两个耦合的单模腔又耗散成无记忆或保持记忆的库。我们发现,增加控制参数,即双模耦合,允许触发和增强的非马尔可夫动力学的量子比特从一个马尔可夫一个在没有耦合。令人惊讶的是,如果量子位动力学对于零控制参数是非马尔可夫的,则增加后者能够实现从非马尔可夫到马尔可夫状态的多次转变。这些结果独立于储层的性质。这项工作强调,适当地设计复合环境各部分之间的耦合可以有效地利用基于非马尔可夫性存储在量子位中的量子存储器。

英文摘要:

Controlling the non-Markovian dynamics of open quantum systems is essential in quantum information technology since it plays a crucial role in preserving quantum memory. Albeit in many realistic scenarios the quantum system can simultaneously interact with composite environments, this condition remains little understood, particularly regarding the effect of the coupling between environmental parts. We analyze the non-Markovian behavior of a qubit interacting at the same time with two coupled single-mode cavities which in turn dissipate into memoryless or memory-keeping reservoirs. We show that increasing the control parameter, that is the two-mode coupling, allows for triggering and enhancing a non-Markovian dynamics for the qubit starting from a Markovian one in absence of coupling. Surprisingly, if the qubit dynamics is non-Markovian for zero control parameter, increasing the latter enables multiple transitions from non-Markovian to Markovian regimes. These results hold independently on the nature of the reservoirs. This work highlights that suitably engineering the coupling between parts of a compound environment can efficiently harness the quantum memory, stored in a qubit, based on non-Markovianity.

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。

↑