论文标题
使用最佳耦合在骨髓的约瑟夫森连接处的动态阻滞
Dynamical blockade in a bosonic Josephson junction using optimal coupling
论文作者
论文摘要
在本文中，我们使用时间依赖性的约瑟夫森耦合来增强在两个耦合非线性骨模式模式的系统中，最初以较弱的人口组成的相干状态加载，因此该进化仅限于高达两个场量量。使用数值最佳控件，我们找到了最佳耦合，该耦合最小化了一种模式的两光子占用，实际上将其转移到另一种模式，同时将非零的单光子职业保持在同一模式下。此外，我们选择连续的耦合在模式之间传递后消失，使它们被脱钩，其中一个仅留给一些单光子种群，可以在其衰减后观察到。在数值上，我们发现在较早的耦合，较大的单光子群体和更长的时间窗口中获得的二阶相关函数的值较低，从而对应于更高的排放效率和更容易的检测。提出的方法不仅限于所研究的系统，但也可以将其转移到其他相关框架中，以找到可以改善这些系统中单光子发射统计数据的最佳驾驶场。
In this article we use time-dependent Josephson coupling to enhance unconventional photon blockade in a system of two coupled nonlinear bosonic modes which are initially loaded with weakly populated coherent states, so the evolution is restricted to the manifold of up to two field quanta. Using numerical optimal control, we find the optimal coupling which minimizes the two-photon occupation of one mode, which is actually transferred to the other, while maintains a non-zero one-photon occupation in the same mode. Moreover, we choose the continuous coupling to vanish after the transfer between the modes such that they are decoupled and one of them is left only with some one-photon population which can be observed upon its decay. We numerically find lower values of the second-order correlation function obtained at earlier times than with constant coupling, with larger one-photon populations and for longer time windows, corresponding thus to higher emission efficiency and easier detection. The presented methodology is not restricted to the system under study, but it can also be transferred to other related frameworks, to find the optimal driving fields which can improve the single-photon emission statistics from these systems.
