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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
On-chip dense quantum frequency comb generation via SFWM in an AlGaAs-on-insulator resonator
Optics Letters
|July 31, 2026
Summary
We developed a broadband quantum frequency comb (QFC) using aluminum gallium arsenide on insulator (AlGaAsOI) resonators. This compact, low-power source is ideal for scalable quantum communication and information processing.
Area of Science:
- Quantum optics
- Integrated photonics
- Materials science
Background:
- Broadband integrated photon sources are crucial for quantum technologies.
- High nonlinear refractive index materials like AlGaAs facilitate efficient nonlinear interactions in integrated cavities.
- Quantum frequency combs (QFCs) offer a promising approach for generating correlated photons.
Purpose of the Study:
- To demonstrate a broadband QFC in a low free spectral range (FSR) AlGaAsOI resonator.
- To achieve dense mode spacing for scalable frequency multiplexing and encoding.
- To enable low-excitation power operation for practical quantum applications.
Main Methods:
- Fabrication of an AlGaAsOI resonator with a low FSR (45 GHz).
- Characterization of the generated quantum frequency comb.
- Measurement of joint-spectral intensity (JSI) and comparison with theoretical models.
Main Results:
- Demonstrated a QFC with up to 40 frequency-correlated modes over a 1.97 THz bandwidth in the C-band.
- Achieved dense mode spacing enabling scalable frequency multiplexing and encoding.
- Operated the device at a low excitation power of 6.33 µW.
- Validated the spectral correlations using a theoretical model.
Conclusions:
- AlGaAsOI resonators are suitable for generating scalable, low-power QFC sources.
- The demonstrated QFC technology has significant potential for quantum communication and information processing.
- The moderate Q-factor offers a beneficial tradeoff for broadband, dense multimode operation.
