Tenders are sought for the Supply, Delivery, Installation and Commissioning a Hong-Ou-Mandel (HOM) interferometer. The HOM interferometer is used to evaluate the indistinguishability of a single photon light source, which serves as the foundation of Quantum Technologies including quantum communications and quantum computing. This measurement is based on two-photon interference. The HOM unit is an add-on unit to be used with the excitation source and collection optics of the existing time-resolved photoluminescent microscope (PicoQuant Microtime200) located at MSB-022 of the Bernal Institute, University of Limerick (UL)