Quantum physics, photons and ping pong balls

Here is an interesting news article about quantum states and how they work, as an elaboration of my comments in lecture this morning.

Blurb:

Researchers have shown that removing a photon from a laser beam can lead to it containing more photons than it had before... Measuring position and momentum in different orders produces different results. "You are working at the quantum level," explains Marco Bellini from the National Institute of Applied Optics in Florence, Italy. "If you did it with ping-pong balls it wouldn't work this way," he says.
K. Sanderson, News@Nature.com, 27 Sept. 2007

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