论文标题
通过三阶总和和差异频率产生的无噪声可见量子频率转换的建议
Proposal for noise-free visible-telecom quantum frequency conversion through third-order sum and difference frequency generation
论文作者
论文摘要
可见光和电信之间的量子频率转换（QFC）是连接基于光纤量子网络中长距离量子记忆的关键功能。当前用于连接此类广泛分离频率的QFC方法，例如总和频率产生和四波混合bragg散射，容易发生泵激光器的宽带噪声。为了解决此问题，我们建议将上转/下调/下调QFC接口使用三阶总和/差异频率生成（TSFG/TDFG）。在此过程中，两个泵光子结合了它们的能量和动量，以介导跨可见的和电信带的频率转换，从而用长波长泵pho弥合了较大的光谱间隙，从噪声角度来看，这尤其有益。我们表明，可以通过TSFG/TDFG通过1990 nm的泵设计，可以设计出波导偶联的氮化硅微孔谐振器，用于在606 nm至1550 nm之间的有效QFC。我们模拟了设备的分散和耦合，并且从模拟参数估计，在50 mW泵浦功率下，频率转换可以是有效的（> 80％）。我们的结果表明，基于微孔子的TSFG/TDFG有望在大光谱间隔内紧凑，可扩展和低功率QFC。
Quantum frequency conversion (QFC) between the visible and telecom is a key functionality to connect quantum memories over long distances in fiber-based quantum networks. Current QFC methods for linking such widely-separated frequencies, such as sum/difference frequency generation and four-wave mixing Bragg scattering, are prone to broadband noise from the pump laser(s). To address this issue, we propose to use third-order sum/difference frequency generation (TSFG/TDFG) for an upconversion/downconversion QFC interface. In this process, two pump photons combine their energy and momentum to mediate frequency conversion across visible and telecom bands, bridging a large spectral gap with long-wavelength pump pho-tons, which is particularly beneficial from the noise perspective. We show that waveguide-coupled silicon nitride microring resonators can be designed for efficient QFC between 606 nm and 1550 nm via a 1990 nm pump through TSFG/TDFG. We simulate the device dispersion and coupling, and from the simulated parameters estimate that the frequency conversion can be efficient (>80 %) at 50 mW pump power. Our results suggest that microresonator-based TSFG/TDFG is promising for compact, scalable, and low power QFC across large spectral gaps.
