A crucial factor for developing fast single-photon emitters (SPEs) for quantum networks is enhancing the spontaneous emission decay rate, to obtain high photon count rates and to overcome dephasing, which suppresses photon indistinguishability. Single photon emitters play a leading role in the functioning of quantum networks. Single-photon emitters come in various forms and during my internship, single fluorescent organic molecules were used. The employed fluorophore ATTO647N is able to emit single photons in the red part of the visible spectrum, around 667 nm. A pivotal point of single photon emitters is the working temperature. For many applications, cryogenic temperatures are required to limit the electron-phonon coupling and its consequent dephasing.