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，我们发展了纠缠光子波包的控制和探测技术。利用单光子水平的波长转换技术，我们成功地构建了一个具有高时间分辨率的单光子探测系统。我们还控制了自发参量下转换过程中产生的光子对的双光子谱分布，并进行了四光子实验。得到的图案显示出具有高活力的量子干涉图案。

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.