Title: Purifying quantum-dot light in a coherent frequency interface Show Chinese title

Title: 在相干频率接口中纯化量子点光

Abstract: Quantum networks typically operate in the telecom wavelengths to take advantage of low-loss transmission in optical fibres. However, bright quantum dots (QDs) emitting highly indistinguishable quantum states of light, such as InGaAs QDs, often emit photons in the near infrared thus necessitating frequency conversion (FC) to the telecom band. Furthermore, the signal quality of quantum emissions is crucial for the effective performance of these networks. In this work we report a method for simultaneously implementing spectral purification and frequency shifting of single photons from QD sources to the C-band in a periodically poled Lithium Niobate waveguide. We consider difference frequency generation in the counter-propagating configuration to implement FC with the output emission bandwidth in units of GHz. Our approach establishes a clear path to integrating high-performance single-emitter sources in a hybrid quantum network. Show Chinese abstract

Abstract: 量子网络通常在电信波长下运行，以利用光纤中的低损耗传输。 然而，发出高度不可区分光量子态的明亮量子点（QDs），例如InGaAs QDs，通常在近红外波段发射光子，因此需要将频率转换（FC）到电信频段。 此外，量子发射的信号质量对于这些网络的有效性能至关重要。 在这项工作中，我们报告了一种方法，可在周期性极化铌酸锂波导中同时实现来自量子点光源的单光子的光谱纯化和频率偏移至C波段。 我们考虑反向传播配置中的差频生成，以GHz为单位实现频率转换的输出发射带宽。 我们的方法为在混合量子网络中集成高性能单发射源铺平了道路。