Wednesday, November 28, 2007

The smile of Schrödinger's cat

"According to Heisenberg's uncertainty principle one can either acknowledge the spin or the exact location of a quantum particle. This strange idea resulted in the Einstein-Podolsky-Rosen paradox, which basically said if two particles were separated over a long distance and one was measured, information about the other could arrive at a speed faster than light, which according the the general relativity is impossible. Now Aspect used this as a model to design an experiment in which he proved the EPR was wrong. Het took apart two spinning particles, send them to two different directions, measured the spin on the first and intantaneously knew the spin on the second. According to some, information is not a physical resource and as such might travel faster than light."

The professor put down his glasses, and suddenly said: "But… if you measure the spin of a particle, don't you first have to localize it?"

Universe collapsed.
And god took the dice and gave them to the professor. "Your turn", said a hoovering voice.

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