Post-selected indistinguishable single-photon emission from the Mollow triplet sidebands of a resonantly excited quantum dot

TL;DR

This paper demonstrates the generation of high-quality, indistinguishable single photons from the Mollow triplet sidebands of a resonantly excited quantum dot, using advanced filtering techniques to enable near-ideal quantum interference.

Contribution

It introduces a novel spectral filtering method to isolate Mollow triplet components for high-visibility two-photon interference in quantum dot emission.

Findings

Achieved near 97% interference visibility.

Demonstrated spectral tunability of Mollow sidebands.

Confirmed emission coherence of approximately 250 ps.

Abstract

Applying high power continuous-wave resonant s-shell excitation to a single self-assembled In- GaAs quantum dot, we demonstrate the generation of post-selected single-indistinguishable photons from the Mollow triplet sidebands. A sophisticated spatial filtering technique based on a double Michelson interferometer enabled us to separate the spectrally close lying individual Mollow components and perform almost background free two-photon interference measurements. Showing high consistency with the results of an independent determination of the emission coherence of 250 +/- 30 ps, our analysis reveals a close to ideal visibility contrast of up to 97 %. Due to their easy spectral tunability and their distinct advantage of cascaded photon emission between the individual Mollow sidebands, they resemble a versatile tool for quantum information applications.