A light bulb isnt very useful without a reliable on/off switch. The same holds true for quantum dots. These ultra tiny electronic nanostructures someday may serve as the ones and zeros used by a superfast quantum computer, but first physicists need to refine their ability to turn quantum dots "on" and "off."
In the June 23, 2003, on-line issue of Applied Physics Letters, researchers from the National Institute of Standards and Technology (NIST) and the National Renewal Energy Laboratory (NREL) take a step in the right direction. They report a way to measure accurately the amount of laser light needed to shift the electrons in a particular type of quantum dot between two discrete states, a low energy, ground state and a higher energy, excited state.
The strength of the interaction between quantum dots and electromagnetic waves like laser light is affectionately known in physical science circles as the "dipole moment." Loosely translated, its a number that tells you how easy the dots are to excite.
Fred McGehan | EurekAlert!
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Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).
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