September 10, 2012
The Heisenberg uncertainty principle is one of the cornerstones of quantum mechanics: it’s impossible to measure anything without disturbing it.
For instance, any attempt to measure a particle’s position must change its momentum.
But never mind all that. It’s wrong, University of Toronto physicists say they have just proven.
(This has important implications for quantum information and especially quantum cryptography, where it is fundamental to the security of certain protocols.)… read more