论文标题
可重构量子网络的GHz脉冲源纠缠光子的光子
GHz-Pulsed Source of Entangled Photons for Reconfigurable Quantum Networks
论文作者
论文摘要
纠缠是量子网络中的通用资源，但是纠缠的光子源通常是针对特定用例定制的。就光子的时间属性的状态调制和可调节性而言，多功能性是灵活网络体系结构和加密原始图的关键，它们超出了量子密钥分布。在这里，我们报告了一种灵活的源设计，该设计在连续波和GHz-rate型脉冲操作模式下产生高质量的纠缠。利用现成的光学组件，我们的方法使用基于光纤的sagnac环在电信波长上生成偏振型的光子，高效率高，富裕度高于0.99。在纠缠状态生成之前，对于快速纠缠状态切换也可能是GHz的相位调制。我们显示100 MHz的相位调制，平均保真度为0.95。此外，源60 nm光谱带宽与完全可重新配置的波长 - 多形量子网络完全兼容。
Entanglement is a universal resource in quantum networks, yet entangled photon sources are typically custom-made for a specific use case. Versatility, both in terms of state modulation and tunability of the temporal properties of the photons, is the key to flexible network architectures and cryptographic primitives that go beyond quantum key distribution. Here, we report on a flexible source design that produces high-quality entanglement in continuous-wave and GHz-rate-pulsed operation modes. Utilizing off-the-shelf optical components, our approach uses a fiber-based Sagnac loop to generate polarization-entangled photons at telecom wavelength with high efficiency and fidelities above 0.99. Phase modulation up to GHz before entangled state generation is also possible for fast entangled state switching. We show phase modulation at 100 MHz with an average fidelity of 0.95. Furthermore, the source 60 nm spectral bandwidth is entirely compatible with fully reconfigurable wavelength-multiplexed quantum networks.
