Light touch: Controlling the behavior of qu...(team uses lasers to precisely control th...)

Date:8/19/2008

team uses lasers to precisely control the energy levels of quantum dots, just as physicists have been doing with actual single atoms since the mid-1970s and, much more recently, with the artificial quantum dot variety. With their customized set-up, which includes two lasersone shining from above the quantum dot and the other illuminating it from the sidethe researchers were able to manipulate energy states in a quantum dot and directly measure its emissions. By adjusting the intensity of the laser beams, they were able to correct for imperfection-caused variations and generate more ideal signals. In so doing, the team was the first to demonstrate that laser-tuned quantum dots can efficiently generate photons one at a time, as required for quantum cryptography and other applications.

While the device currently still requires quite cold temperatures and sits in a liquid helium bath, it is compact enough to fit in the palm of your handan elegant setup that could be eventually implemented in quantum cryptography applications.

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Contact: Mark Bello mark.bello@nist.gov 301-975-3776 National Institute of Standards and Technology (NIST) Source:Eurekalert

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