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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Published on: October 13, 2017

Transform-limited single photons from a single quantum dot.

Andreas V Kuhlmann¹, Jonathan H Prechtel¹, Julien Houel^1,2

¹Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

Nature Communications

|September 9, 2015

Summary

This summary is machine-generated.

Researchers achieved transform-limited single photons from quantum dots, crucial for quantum networks. Controlling nuclear spins minimized noise, enabling indistinguishable photons for future quantum communication.

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Area of Science:

Quantum photonics
Solid-state physics
Quantum information science

Background:

Quantum photonics networks require indistinguishable single photons.
Solid-state emitters face environmental noise, hindering transform-limited linewidths.
Quantum dots offer promising emitter properties but achieving transform-limited linewidths remains a challenge.

Purpose of the Study:

To engineer quantum dots for producing transform-limited single photons.
To overcome environmental noise limitations in solid-state single-photon emitters.
To enable the development of robust quantum photonics networks.

Main Methods:

Utilized layer-by-layer growth and nano-fabrication of quantum dots.
Engineered electronic and photonic states within the quantum dot.
Controlled nuclear spins to mitigate exciton dephasing via the Overhauser field.

Main Results:

Achieved transform-limited linewidths on second timescales for neutral excitons.
Observed transform-limited linewidths for charged excitons near saturation.
Demonstrated the critical role of nuclear spin control in reducing dephasing.

Conclusions:

Quantum dots can be engineered to emit transform-limited single photons.
Control over nuclear spins is essential for achieving high-fidelity single-photon sources in solid-state systems.
This work advances the development of quantum photonics networks by providing a viable single-photon source.