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

TL;DR

This paper investigates a laser-based scheme to produce narrow-linewidth, antibunched single photons from a two-level system, demonstrating robustness against dephasing and detuning effects, and improving upon standard methods.

Contribution

It introduces a laser interference scheme that achieves subnatural linewidth single photons with antibunching, even with dephasing and detuning, advancing quantum light source technology.

Findings

Scheme produces subnatural linewidth single photons.

Performance remains robust under dephasing.

Significant improvement over standard emission methods.

Abstract

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