Control of a wavepacket for temporally entangled photons

为了在强关联光子系统中探索新的光学科学，我们开发了纠缠光子波包的控制和检测技术。我们利用单光子水平上的波长转换技术，成功地构建了一个高时间分辨率的单光子探测系统。我们还控制了自发参数下转换过程产生的光子对的双光子光谱分布，并进行了四个光子实验。合成的图案显示出能见度高的量子干涉图案。

We have developed control and detection techniques of an entangled-photon wavepacket in order to explore novel optical science in a strongly correlated photon system. We have successfully constructed a single-photon detection system with high temporal resolution, utilizing a wavelength-conversion technique at the single-photon level. Also we controlled two-photon spectral distribution of photon pairs generated form a spontaneous parametric down-conversion process, and performed four photon experiments. The resultant patterns showed quantum interference patterns with high visibilities.