Near Transform-Limited Single Photons from an Efficient Solid-State Quantum Emitter

TL;DR

This paper demonstrates the generation of long streams of near transform-limited single photons from a quantum dot system with high indistinguishability, suitable for advanced quantum information applications.

Contribution

We achieved high-quality, long-duration streams of near transform-limited single photons with stable indistinguishability from a solid-state quantum emitter.

Findings

Generated thousands of near transform-limited photons with high mutual indistinguishability.

Observed Hong-Ou-Mandel interference with visibility above 92% over microsecond timescales.

Spectral analysis confirms photons are close to the transform limit.

Abstract

By pulsed s-shell resonant excitation of a single quantum dot-micropillar system, we generate long streams of a thousand of near transform-limited single photons with high mutual indistinguishability. Hong-Ou-Mandel interference of two photons are measured as a function of their emission time separation varying from 13 ns to 14.7 {\mu}s, where the visibility slightly drops from 95.9(2)% to a plateau of 92.1(5)% through a slow dephasing process occurring at time scale of 0.7 {\mu}s. Temporal and spectral analysis reveal the pulsed resonance fluorescence single photons are close to transform limit, which are readily useful for multi-photon entanglement and interferometry experiments.