Conference Paper Testing Born's rule in quantum mechanics for three nutually ...
https://www.telegraphindia.com/india/to-be-precise-from-ju-to-physics-feat/cid/498684
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New Delhi, July 22: A Jadavpur University-educated Indian physicist in Canada has helped perform a high-precision experiment to test for the first time one of the most fundamental postulates of quantum mechanics — a bedrock theory of physics.
Urbasi Sinha and her colleagues in Austria, Canada and France have confirmed what physicists call Born’s rule, a law formulated by the German physicist and quantum mechanics pioneer Max Born in 1926.
Their experiment reveals how nature works at the tiniest of scales and may nudge scientists closer towards their long-standing goal of unifying the two grand theories of physics — quantum mechanics and gravity.
A research paper by the five-member team of physicists describing the experimental results will appear in the US journal Science on Friday.
Quantum mechanics describes perfectly, among other things, the sometimes bizarre behaviour of the universe at its smallest scales — for instance, it can explain how a subatomic particle may appear to occupy two places at the same time.
Sinha and her co-workers used lasers to fire single photons towards three whisker-thin slits to test Born’s rule, a quantum mechanics law that assigns probabilities for events to occur.
“This gives us a clean, precise test for Born’s rule,” said Sinha, a postdoctoral scientist at the Institute of Quantum Computing (IQC) at the University of Waterloo, Canada."
It's not different from the two-slit experiment; nor from any experiment that studies diffraction of particles. It was first performed by Davisson and Germer in the 1920s, to test de Broglie's idea abut the wave-like properties of electrons, in fact.
The claims about the paper are, of course, overblown. Electron diffraction tests the same issue, using many more ``slits''-and no deviations from what's expected have been found.
Nor does the experiment have anything to do about any quantum properties of gravity, in particular, since spacetime remains classical.
In triple slit experiment there exists some exotic loop trajectories.
Ref: Exotic looped trajectories of photons in three-slit interference
Omar S Magaña-Loaiza et al, Nature Communications volume 7, Article number: 13987 (2016)
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