Realization and application of single photons in a single spatio-temporal mode by group velocity engineering

本项目的目标是实现具有时空相干的单光子源及其在光量子电路中的应用。结果，我们成功地实现了双光子干涉可见度为95.8%的单光子源。我们还成功地实现了提取双光子输入之间一定偏振关联的纠缠滤光器，以及Knill et提出的受控非光量子电路。艾尔2001年，迈向可伸缩线性光学量子计算的第一步。我们还研制了用于群速度色散控制的准相位匹配装置，并对其进行了评价。

The aim of this project was to realize single photon sources with spatio-temporal coherence and its application to optical quantum circuits. As a result, we succeed in the realization of a single photon source with two photon interference visibility of 95.8%. We also succeeded in the realization of 'an entanglement filter' which extracts certain polarization correlations between the two-photon inputs, and 'controlled-NOT optical quantum circuit' which was proposed by Knill et. al. in 2001 and the first step towards the scalable linear optics quantum computation. We also developed quasi phase matching devices for the control of group velocity dispersion and evaluated them.