Posts tagged ‘uncertainty principle’

September 7th, 2012

“The Heisenberg Uncertainty Principle was Never Quite Right”

by Max Andrews

Pioneering experiments have cast doubt on a founding idea of the branch of physics called quantum mechanics.

The Heisenberg uncertainty principle is in part an embodiment of the idea that in the quantum world, the mere act of observing an event changes it.

But the idea had never been put to the test, and a team¬†writing in Physical Review Letters¬†says “weak measurements” prove the rule was never quite right.

That could play havoc with “uncrackable codes” of quantum cryptography.

Quantum mechanics has since its very inception raised a great many philosophical and metaphysical debates about the nature of nature itself.

The experiment requires preparing pairs of “entangled” photons, the particles from which light is made (BBC)