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The elastic scattering peak of a resonantly driven two-level system has beenargued to provide narrow-linewidth antibunched photons. Although independentmeasurements of spectral width on the one hand and antibunching on the otherhand do seem to show that this is the case, a joint measurement reveals thatonly one or the other of these attributes can be realised in the directemission. We discuss a scheme which interferes the emission with a laser toproduce simultaneously single photons of subnatural linewidth. In particular,we consider the effect of dephasing and of the detuning between the drivinglaser and/or the detector with the emitter. We find that also in presence ofdephasing, our scheme brings considerable improvement as compared to thestandard scheme.

Impact of detuning and dephasing on a laser-corrected subnatural-linewidth single-photon source