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Updated: Jun 14, 2026
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
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Coherent light scattering from a telecom C-band quantum dot.
L Wells1,2, T Müller3, R M Stevenson1
1Toshiba Research Europe Limited, 208 Science Park, Milton Road, Cambridge, CB4 0GZ, UK.
Nature Communications
|December 15, 2023
Summary
Researchers generated telecom-wavelength photons with long coherence times using InAs/InP quantum dots. This breakthrough advances quantum networks for secure communication and distributed quantum computing.
Area of Science:
- Quantum photonics
- Solid-state quantum emitters
Background:
- Quantum networks require coherent light sources at telecom wavelengths for fiber-based implementations.
- Existing sources struggle with Fourier-limited emission and subnatural linewidths in the visible to near-infrared range.
Purpose of the Study:
- To demonstrate long coherence time photons at telecom wavelengths using InAs/InP quantum dots.
- To enable practical fiber-based quantum communication and computing.
Main Methods:
- Utilized elastic and inelastic scattering of excitation laser photons from InAs/InP quantum dots.
- Measured photon coherence times relative to the Fourier limit.
- Demonstrated two-photon interference after 25 km of optical fiber.
Main Results:
- Achieved photons with coherence times significantly exceeding the Fourier limit at telecom wavelengths.
- Inelastically scattered photons also exhibited coherence times near the Fourier limit.
- Confirmed finite interference visibility for photons separated by ~100,000 excitation cycles over 25 km fiber.
Conclusions:
- InAs/InP quantum dots are promising sources for fiber-based quantum networks.
- Demonstrated the potential for long-distance quantum communication and distributed quantum computing using these sources.
