Stimulated Emission as a Result of Multiphoton Interference
Fang‐Wen Sun, Bi‐Heng Liu, Yan-Xiao Gong, Yun‐Feng Huang, Z. Y. Ou, Guang‐Can Guo · Physical Review Letters · 2007
By performing an experiment on stimulated emission by two photons in the parametric amplification process and comparing it to a three-photon interference scheme, we present evidence in support of the idea that the underlying physics of stimulated emission is simply the constructive interference due to photon indistinguishability. So the observed signal enhancement upon the input of photons can be interpreted as a result of multiphoton interference of the input photons and the otherwise spontaneously emitted photon from the amplifier.