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Updated: Apr 29, 2026
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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A quantum-coherent photon-emitter interface in the original telecom band
Marcus Albrechtsen1, Severin Krüger2, Juan C Loredo3
1Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark. m.albrechtsen@nbi.ku.dk.
Nature Nanotechnology
|April 27, 2026
Summary
Quantum dots now achieve high-quality photon emission at telecom wavelengths. This breakthrough paves the way for scalable quantum networks and silicon photonics integration.
Area of Science:
- Quantum Information Science
- Materials Science
- Optoelectronics
Background:
- Quantum dots are superior quantum emitters, offering high-quality, high-rate, and pure photons.
- Existing quantum dot technology struggles to operate efficiently at telecom wavelengths, hindering integration with fiber-optic infrastructure and silicon photonics.
Purpose of the Study:
- To develop high-quality quantum materials and devices for telecom wavelength operation.
- To realize a quantum-coherent photon-emitter interface integrated into a waveguide.
Main Methods:
- Demonstration of waveguide-integrated Indium Arsenide (InAs) quantum dots.
- Characterization of the quantum-coherent photon-emitter interface in the O-band (1,260–1,360 nm).
Main Results:
- Achieved a quantum-coherent photon-emitter interface operating in the telecom O-band.
- Recorded transform-limited linewidths, only 8% broader than the inverse lifetime.
- Demonstrated a bright emission rate of 41.7 MHz under 80-MHz π-pulse excitation.
Conclusions:
- Waveguide-integrated InAs quantum dots successfully operate at telecom wavelengths.
- The demonstrated performance highlights the potential for scalable quantum networks.
- This work bridges the gap towards practical quantum communication and computing systems.
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