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Details of Grant 

EPSRC Reference: GR/S96418/01
Title: Absorption spectroscopy on single quantum dots
Principal Investigator: Warburton, Professor R
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Ludwig Maximilian University of Munich University of California, Santa Barbara
Department: Sch of Engineering and Physical Science
Organisation: Heriot-Watt University
Scheme: Standard Research (Pre-FEC)
Starts: 19 August 2004 Ends: 18 August 2007 Value (£): 251,881
EPSRC Research Topic Classifications:
Materials Characterisation
EPSRC Industrial Sector Classifications:
Electronics
Related Grants:
Panel History:  
Summary on Grant Application Form
Self-assembled quantum dots are semiconductor nanostructures which in some ways behave as artificial atoms even though they are embedded in a solid matrix. They have ideal optical properties. At low temperature, a single quantum dot emits a spectrally pure single line, a property which can potentially be exploited for novel devices operating on single quantum dots. Examples include a single photon source and the element in a quantum computer. Absorption spectroscopy is the method of choice to investigate individual quantum dots as it provides a large amount of information with the absolute minimum perturbation. Notably, the dephasing rate of excitons, a crucial issue for all future single dot devices, can be determined by measuring the linewidth of the resonance. However, absorption on a single quantum dot is a difficult experiment to.carry out. Nevertheless, these experiments are now possible following developments in the Nano-optics Laboratory at Heriot-Watt University. The present proposal aims to exploit this development in order to understand the dephasing properties, to investigate the regime where the quantum dot interacts with a resonant laser field, and to magnify the signal so that the quantum dot interacts with flying qubits, the photons.
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Organisation Website: http://www.hw.ac.uk