论文标题
通过可切换腔重复使用光子来扩增级联的下调
Amplification of cascaded downconversion by reusing photons with a switchable cavity
论文作者
论文摘要
有效产生和操纵非古典状态的能力是开发量子光学技术的关键要求。近年来,实验表明,级联的自发参数下调是实施光子预认证的一种有前途的方法,它提供了一种克服量子通信的光子传输损失的方法,并直接产生纠缠的三个光子状态和预言钟形。但是,迄今为止,此过程的低效率将其适用性限制在基本实验之外。在这里,我们提出了一个方案,通过使用快速开关和延迟循环来扩大三重态生产速率,以重复使用第一次通过的光子通过喀斯喀特的第二个非线性晶体。我们构建一个理论模型,以预测放大率并在实验实施中验证它们。我们的概念验证设备提高了所预测的检测到的光子三重态速率,表明该方法有可能显着提高级联下降转换对设备独立的量子通信和纠缠状态生成的实用性。
The ability to efficiently produce and manipulate nonclassical states of light is a critical requirement for the development of quantum optical technologies. In recent years, experiments have demonstrated that cascaded spontaneous parametric down-conversion is a promising approach to implement photon precertification, providing a way to overcome photon transmission losses for quantum communication, as well as to directly produce entangled three-photon states and heralded Bell pairs. However, the low efficiency of this process has so far limited its applicability beyond basic experiments. Here, we propose a scheme to amplify triplet production rates by using a fast switch and a delay loop to reuse photons that fail to convert on the first pass through the cascade's second nonlinear crystal. We construct a theoretical model to predict amplification rates and verify them in an experimental implementation. Our proof-of-concept device increases the rate of detected photon triplets as predicted, demonstrating that the method has the potential to dramatically improve the usefulness of cascaded down-conversion for device-independent quantum communication and entangled state generation.