Resonance fluorescence from a telecom-wavelength quantum dot

TL;DR

This paper demonstrates resonance fluorescence from a single quantum dot at telecom wavelengths, revealing the Mollow triplet and enabling advanced quantum optics applications in telecommunications.

Contribution

It provides the first high-resolution spectroscopy of resonance fluorescence at telecom wavelengths and characterizes charge noise, advancing quantum dot control for quantum communication.

Findings

Observation of Mollow triplet in telecom quantum dots

Ruling out pure dephasing as a major decoherence mechanism

Potential for on-demand indistinguishable single photon generation

Abstract

We report on resonance fluorescence from a single quantum dot emitting at telecom wavelengths. We perform high-resolution spectroscopy and observe the Mollow triplet in the Rabi regime--a hallmark of resonance fluorescence. The measured resonance-fluorescence spectra allow us to rule out pure dephasing as a significant decoherence mechanism in these quantum dots. Combined with numerical simulations, the experimental results provide robust characterisation of charge noise in the environment of the quantum dot. Resonant control of the quantum dot opens up new possibilities for on-demand generation of indistinguishable single photons at telecom wavelengths as well as quantum optics experiments and direct manipulation of solid-state qubits in telecom-wavelength quantum dots.