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February 18th, 2010
Now You See It: How To Spot Quantum Behaviour
Abstract:
Distinguishing quantum behaviour from its classical counterpart is harder than it sounds. Now a group of theorists have worked out how a few simple measurements can do the trick.
Today, Neill Lambert at the Institute of Physical and Chemical Research (RIKEN) in Japan and few buddies say they've solved the problem. What they've done is "formulate a set of inequalities that would allow an experimentalist to exclude the possibility of a classical description of transport through a nanostructure."
All an experimentalist has to do is measure the local charge in the device as well as the current flow through it. If the results violate the Lambert team's inequalities, then there's definitely quantum behaviour in the air.
That's a useful trick to have up your sleeve but it may have wider application. Lambert and company say that similar inequalities can be derived to test the quantum behaviour of other systems such as atom-field interactions in quantum optics and the quantum behaviour of networks of quantum dots, Cooper pair boxes and even molecules.
Source:
technologyreview.com
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