论文标题
噪声辅助量子相干保护在等级环境中
Noise assisted quantum coherence protection in hierarchical environment
论文作者
论文摘要
在本文中，我们通过利用噪声来研究量子系统与层次环境相连的相干保护。例如，我们在存在经典噪声和量化噪声的情况下解决了Jaynes-Cummings（J-C）模型。主方程是超出马尔可夫近似之外的，其中考虑了两个声音的记忆效应的影响。更重要的是，我们发现连贯保护的性能敏感地取决于两个声音的非马克维亚特性。通过分析相干保护的数学机制，我们表明了由较长记忆时间的非马克维亚噪声引起的变质，可以通过更短的记忆时间来抑制Markovian噪声。最后但并非最不重要的一点是，作为一种前景，我们尝试分析原子腔纠缠与原子连贯性之间的联系，然后讨论搜索所需噪声的可能线索。本文提出的结果表明，通过利用噪声来保护连贯性的可能性，并可能为设计噪声辅助的连贯保护方案打开了新的途径。
In this paper, we investigate coherence protection of a quantum system coupled to a hierarchical environment by utilizing noise. As an example, we solve the Jaynes-Cummings (J-C) model in presence of both a classical and a quantized noise. The master equation is derived beyond the Markov approximation, where the influence of memory effects from both noises is taken into account. More importantly, we find that the performance of the coherence protection sensitively depends on the non-Markovian properties of both noises. By analyzing the mathematical mechanism of the coherence protection, we show the decoherence caused by a non-Markovian noise with longer memory time can be suppressed by another Markovian noise with shorter memory time. Last but not least, as an outlook, we try to analyze the connection between the atom-cavity entanglement and the atomic coherence, then discuss the possible clue to search for the required noise. The results presented in this paper show the possibility of protecting coherence by utilizing noise and may open a new path to design noise-assisted coherence protection schemes.
