论文标题
通过快捷方式到绝热性的有效宽带频率转换
Efficient broadband frequency conversion via shortcut to adiabaticity
论文作者
论文摘要
与两个级别的原子系统类似,绝热频率转化的方法已被最近提出并实验验证,以实现稳健的频率混合过程,例如总和和差异频率产生。在这里,我们介绍了使用多种与绝热性(STA)的快捷方式(例如反脱糖驾驶和基于不变的反向工程)进行有效频率混合的比较研究。我们表明,可以通过正确设计定期螺旋晶体的极点结构以及输入灯和晶体之间的耦合来执行总和频率的产生。频率转换所需的晶体长度显着降低了绝热极限。我们的方法显着提高了该过程与温度变化以及信号频率变化的鲁棒性。通过引入具有恒定耦合的单个参数控制技术,并与逆工程,扰动理论和最佳控制结合,我们表明,相对于输入波长和晶体温度的波动,可以进一步优化相位不匹配,从而导致新颖的实验可实现的混合方案。
The method of adiabatic frequency conversion, in analogy with the two level atomic system, has been put forward recently and verified experimentally to achieve robust frequency mixing processes such as sum and difference frequency generation. Here we present a comparative study of efficient frequency mixing using various techniques of shortcuts to adiabaticity (STA) such as counter-diabatic driving and invariant-based inverse engineering. We show that, it is possible to perform sum frequency generation by properly designing the poling structure of a periodically poled crystal and the coupling between the input lights and the crystal. The required crystal length for frequency conversion is significantly decreases beyond the adiabatic limit. Our approach significantly improves the robustness of the process against the variation in temperature as well as the signal frequency. By introducing a single parameter control technique with constant coupling and combining with the inverse engineering, perturbation theory and optimal control, we show that the phase mismatch can be further optimized with respect to the fluctuations of input wavelength and crystal temperature that results into a novel experimentally realizable mixing scheme.