The Two-Photon Interference Experimental Module is a sub-module of the quantum entanglement system. It utilizes the quantum entanglement system as a "heralded single-photon source" to generate single photons. In the two-photon interference experiment, linear optical elements adjust two photon paths to zero optical path difference (OPD), preparing identical photon pairs before inputting them into a beam splitter (BS). This demonstrates quantum two-photon interference phenomena (Hong-Ou-Mandel effect)—fundamentally distinct from classical optical interference.

This module helps experimenters gain a deep understanding of two-photon interference principles and intuitively verify quantum interference phenomena. It is highly suitable for foundational teaching and laboratory construction in university quantum optics and quantum information courses, effectively supporting talent cultivation and scientific research in related fields.