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Indistinguishability of Remote Quantum-Dot-Cavity Single-Photon Sources
Mathias Pont1,2, Stephen C Wein2, Ilse Maillette de Buy Wenniger1,3
1Centre de Nanosciences et de Nanotechnologies, Université Paris-Saclay, CNRS, 10 Thomas Gobert Boulevard, Palaiseau 91120, France.
Nano Letters
|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.
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.
