Applied Physics

Quantum Dots Heated into Harmony

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Science  08 Jun 2007:
Vol. 316, Issue 5830, pp. 1395
DOI: 10.1126/science.316.5830.1395b

The cavity quantum electrodynamics framework, in which an atom in a cavity is coupled to the cavity's optical modes, is being explored as a potential building block for quantum information-processing architectures. However, atom mobility within the cavity can hinder control of the process. The use of artificial atoms, or quantum dots, confined to a high-quality optical cavity is one possible solid-state solution to the dynamics issue. Despite being designed to be identical, though, the dots can differ slightly from one another in size and atomic composition, thereby giving rise to distinct excitation spectra for each dot. This spectral variability is expected to cause a problem for communication between dots in an ensemble. By heating individual quantum dots through the laser excitation of a nearby connected heat pad, Faraon et al. show that the spectra of individual dots can be tweaked by up to 1.8 nm, thus providing the possibility of tuning the excitation spectra of an ensemble of quantum dots. — ISO

Appl. Phys. Lett. 90, 213110 (2007).

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