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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.

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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.