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Posted: Jan 11, 2012

Scientist searches for quantum limit using polystyrene balls (w/video)

(Nanowerk News) A physicist at the University of Southampton is using polystyrene balls of increasing size to recreate classic physic experiments to test the limits of quantum mechanics.
He describes how this works on You Tube today:
Hendrik Ulbricht has been awarded a Foundational Questions Institute (FQXi) grant of $140,000 to carry out these experiments which could reveal where the quantum realm ends and where the classical world begins. Dr Ulbricht will look at interference patterns of the balls and recreate a polystyrene test which has all the elements of Thomas Young's two slit experiment, in which light from a single source is shone through a pair of slits and onto a screen, where an interference pattern of light and dark bands appear. In physics, interference is something that happens when two light waves come together. In quantum physics, even a single particle itself can interfere.
Over the years, single particle interference patterns have been created by firing electrons, atoms and even large molecules at the slits. Dr Ulbricht hopes to push the quantum-classical boundary a big step further by demonstrating interference using polystyrene balls that are a thousand times heavier than the largest molecules tested so far.
"Nobody has done this with polystyrene before, but it looks very promising," said Dr Ulbricht. "These experiments will help to understand the mechanism which links the quantum to the classical world in a consistent picture."
The Microstructured Optical Fibre group led by Professor David Richardson at the University of Southampton's Optoelectronics Research Centre developed the optical fibres to guide the particles through the process.
Source: University of Southampton
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