Science
Scientists control quantum dot behavior
Gaithersburg, Md. | August 21, 2008 12:01:13 AM IST
U.S. scientists say they have discovered a new method of using resonant lasers to control the behavior of quantum dots. The researchers from the National Institute of Standards and Technology and the Joint Quantum Institute -- a collaborative center of the University of Maryland and NIST -- say their new technology fine-tunes the light coming from quantum dots by manipulating them with pairs of lasers. The scientists said their technique could significantly improve quantum dots as a source of pairs of entangled photons, a property with important applications in quantum information technologies. They said the finding might accelerate development of powerful advanced cryptography applications, projected to be a key 21st-century technology. Quantum dots are nanoscale regions of a semiconductor material similar to the material in computer processors, but with special properties due to their tiny dimensions. The research is presented in the journal Physical Review Letters. (UPI)
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