Temporal modes (TMs) are field-orthogonal broadband wave-packet states of light occupying a common frequency band, and they can encode information in a higher-dimensional alphabet compared to, say, photon polarization. The key—yet still missing—ingredient for the full implementation of a system deploying TMs is a highly selective quantum pulse gate—a multiplexing device that can route photonic packets according to their temporal shape with high temporal-mode discrimination and high efficiency, figures of merit that together we call high selectivity. Here, we present the first implementation of a highly selective quantum pulse gate. The method is a generalization of all-optical Ramsey interferometry, so far demonstrated only for continuous-wave light fields [Phys. Rev. Lett. 117, 223601 (2016) [CrossRef] ]. As applied to temporal modes, we refer to the method as temporal-mode interferometry.

中文翻译：

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使用全光学Ramsey干涉术的光子时间模态的高选择性量子脉冲门控

时间模式（TM）是占据公共频带的正交场宽带光波状态，与例如光子偏振相比，它们可以以更高维度的字母对信息进行编码。全面实施部署TM的系统的关键要素（至今仍不存在）是高度选择性的量子脉冲门，这是一种多路复用设备，可以根据光子数据包的时间形状路由它们，具有高的时间模式辨别力和高效率。值得一提的是，我们将其称为高选择性。在这里，我们介绍了高选择性量子脉冲门的第一个实现。该方法是全光学Ramsey干涉仪的推广，到目前为止仅针对连续波光场进行了演示[Phys。莱特牧师 117，223601（2016）[交叉引用] ]。当应用于时间模式时，我们将该方法称为时间模式干涉测量法。