论文标题
不可区分的光子分裂：使用线性光学元件超过光子阻滞的极限
Splitting indistinguishable photons: Using linear optics to exceed the limit of photon blockade
论文作者
论文摘要
光子 - 光子相互作用是量子光子信息处理的重要要求。产生这些相互作用的一种方法是使用强烈耦合到光腔的原子。该系统表现出光子阻滞效应，可实现单个光子开关和非古典光的创建。但是该系统启用了非线性效应，受到基本的时间带宽约束。对于将两个无法区分光子的输入脉冲分解的简单情况，该约束对将光子的效率限制为将光子的效率限制为不同的输出端口。我们表明，可以通过将强耦合原子与线性光学元件组合来超过该极限。通过优化线性光转换的统一，我们可以提高未进入和纠缠的光子的分裂效率。我们的结果表明，可以通过适当使用线性光学器件来提高单个光子水平上非线性光学过程的效率。这些结果可能对使用光子的量子信息处理有影响。
Photon-photon interactions are an essential requirement of quantum photonic information processing. One way to generate these interactions is to utilize an atom strongly coupled to an optical cavity. This system exhibits the photon blockade effect which enables single photon switching and creation of non-classical light. But the nonlinear effects enabled by this system suffer from a fundamental time-bandwidth constraint. For the the simple case of splitting an input pulse of two indistinguishable photons, this constraint imposes a limit on the efficiency of routing photons to different output ports. We show that this limit can be exceeded by combining the strongly-coupled atom with linear optics. By optimizing the unitary of the linear optical transformation, we achieve improved splitting efficiency for both un-entangled and entangled photons. Our results suggest that it may be possible to improve the efficiency of nonlinear optical processes at the single photon level by making suitable use of linear optics. These results could have implications for quantum information processing with photons.
