Four-photon interference with asymmetric beam splitters
Bi‐Heng Liu, Fang‐Wen Sun, Yan-Xiao Gong, Yun‐Feng Huang, Guang‐Can Guo, Z. Y. Ou · Optics Letters · 2007
Two experiments of four-photon interference are performed with two pairs of photons from parametric downconversion with the help of asymmetric beam splitters. The first experiment is a generalization of the Hong-Ou-Mandel interference effect to two pairs of photons while the second one utilizes this effect to demonstrate a four-photon de Broglie wavelength of lambda/4 by projection measurement.