present paper. To preserve the validity of our approach, quasi-resonant pumping (either in the p-shell, or using a resonant mechanism assisted by the creation of a phonon) or direct resonant pumping should be used [26, 27], where the pump power is expected to have no influence on the density of carriers around the quantum dot and thus has no influence on the pure dephasing rate. Moreover, as the temperature also acts on the QD-cavity detuning, it is necessary to use another parameter to adjust it, for instance the electric-field [14] or a tunable microcavity [17]. Another promising approach could consist in optically pumping a quantum well positioned in the vicinity of the quantum dot: by controlling the carrier density in the quantum well, one could adjust the amount of decoherence induced by Coulomb interaction between the trapped exciton and the nearby quantum dot under study. The development of such a device would allow to explore the new regimes for CQED studied in the present paper and directly check the influence of the pure dephasing rate on the dynamics of the QD cavity coupling. Moreover it would realize a novel type of nano-photonic device based on the exploitation of decoherence, showing that pure dephasing is a resource specific to solid-state emitters, as it will be shown in the following examples. In particular, we propose strategies based on this control to optimize the figures of merit of single photon sources and nanolasers. A figure of merit usually considered for single photon sources is the efficiency of the device. Assuming that the detector is perfectly geometrically coupled to the cavity channel of losses, this corresponds to the probability for the photons to be spontaneously emitted in the cavity mode, which is usually denoted β . The behavior of this parameter, also considering the effects of pure dephasing and atom-cavity detuning, is studied in Ref. [11], However, the system was studied in the spontaneous emission picture, which does not model a usual photoluminescence experiment where the atom is typically pumped in continuous wave. In this context, an interesting figure of merit for a single photon source is the rate of photons that is emitted in the cavity loss channel, N . To describe the pumping mechanism on the atom, one has to add to the master equation a Lindblad operator that is formally expressed as IV. BROAD EMITTER-BASED SINGLE PHOTON SOURCES 9