Demonstration of coherent time-frequency Schmidt mode selection using dispersion-engineered frequency conversion
Demonstration of coherent time-frequency Schmidt mode selection using dispersion-engineered frequency conversion
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DOI：
10.1103/physreva.90.030302
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发表时间：
2014-09-12
影响因子：
2.9
通讯作者：
Silberhorn, Christine
中科院分区：
文献类型：
--
作者：
Brecht, Benjamin;Eckstein, Andreas;Silberhorn, Christine
超快量子态的时频施密特（TFS）模式与高比特率集成量子通信网络天然兼容。因此，它们为实现高维量子光学提供了一种有吸引力的替代方案。在这里，我们提出了一种基于非线性光波导中色散工程超快频率转换的量子脉冲门，这是利用 TFS 模式潜力的关键要素。我们通过实验检索了我们设备的模态谱时结构，并展示了 80% 的单模操作保真度，但受到实验缺陷的限制。此外，当量子脉冲门在单光子水平上运行时，我们获得了 87.7% 的转换效率和 8.8 的高信噪比。
Time-frequency Schmidt (TFS) modes of ultrafast quantum states are naturally compatible with high-bit-rate integrated quantum communication networks. Thus they offer an attractive alternative for the realization of high-dimensional quantum optics. Here, we present a quantum pulse gate based on dispersion-engineered ultrafast frequency conversion in a nonlinear optical waveguide, which is a key element for harnessing the potential of TFS modes. We experimentally retrieve the modal spectral-temporal structure of our device and demonstrate a single-mode operation fidelity of 80%, which is limited by experimental shortcomings. In addition, we retrieve a conversion efficiency of 87.7% with a high signal-to-noise ratio of 8.8 when operating the quantum pulse gate at the single-photon level.