P, M., Ts, B., D, U.-O., J, D. and K, M.-W. 2022. Observation of single photon interference and Hong-Ou-Mandel dip. Scientific transaction of the National University of Mongolia. Physics. 25, 478 (Feb. 2022), 10–15. DOI:https://doi.org/10.22353/physics.v25i478.166.