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

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Indistinguishability of Remote Quantum-Dot-Cavity Single-Photon Sources.

Mathias Pont^1,2, Stephen C Wein², Ilse Maillette de Buy Wenniger^1,3

¹Centre de Nanosciences et de Nanotechnologies, Université Paris-Saclay, CNRS, 10 Thomas Gobert Boulevard, Palaiseau 91120, France.

|September 11, 2025

Summary

Researchers achieved high remote indistinguishability for photons from semiconductor quantum dots (QDs) in cavities. This advances optical quantum technologies by improving single-photon source performance.

Keywords:

Hong−Ou−Mandel interference indistinguishable photons quantum-dot single-photon sources quantum-dot-cavity devices

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Area of Science:

Quantum Optics
Solid-State Physics
Quantum Information Science

Background:

Scaling optical quantum technologies requires reliable, identical single-photon sources.
Remote generation of indistinguishable photons is crucial for networked quantum systems.

Purpose of the Study:

To investigate the Hong-Ou-Mandel interference of photons from remote semiconductor quantum dot (QD) sources.
To quantify the degree of remote indistinguishability achievable with QD-based sources in cavities.
To analyze the factors limiting photon indistinguishability.

Main Methods:

Utilizing deterministic fabrication to position QDs in spectrally resonant micropillar cavities.
Electrically tuning QD operation wavelengths for precise spectral matching.
Performing Hong-Ou-Mandel interference measurements on photons from matched remote QD pairs.
Analyzing the contributions of dephasing and spectral diffusion to photon distinguishability.

Main Results:

Demonstrated remote indistinguishability between 44% and 69% for photons from matched QD pairs in cavities.
Achieved record indistinguishability values for quantum dots integrated into optical cavities.
Identified low-frequency noise as the primary contributor to remaining photon distinguishability.

Conclusions:

Semiconductor quantum dots in cavities offer a promising platform for generating indistinguishable photons remotely.
Precise spectral matching and cavity integration are key to improving remote indistinguishability.
Mitigating low-frequency noise is essential for further advancements in quantum networking.