摘要
We report a fourth-order interference experiment in which pairs of photons are produced in spontaneous parametric down-conversion pumped by femtosecond pulses interfere in a Hong-Ou-Mandel interferometer.The visibilityof the interference is(64±4)%,exceeding the bound of 50%predicted by classical interference theory.
基金
Supported by National Natural Science Foundation of China(Grant No.19874056)
National Natural Science Foundation of China for Youth(Grant No.69907005).
