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Department of Physics

The Cavendish Laboratory

Diagram of a single photon LEDWe are using advanced growth and fabrication technologies to demonstrate single-photon sources, entangled-photon sources and detectors for use in quantum information applications. This work is based on the use of self-assembled InAs quantum dots embedded in GaAs-AlGaAs structures. Our achievements include:

  • The first electrically driven single-photon source.
  • Single- and multi-photon detectors based on field effect transistor and resonant tunnelling diode structures.
  • Optically and electrically driven single-photon sources operating at 1300nm for optical fibre applications.
  • The first triggered source of entangled-photon pairs based on a biexciton/exciton cascade.
  • Developing growth techniques to place InAs quantum dots laterally within a device structure.

An array of placed InAs quantum dotsThis project involves a close collaboration with the Quantum information group of Toshiba Research Europe Ltd..