[BobS]

"Unlike polarisation, which is restricted to just two states (clockwise and anticlockwise), orbital angular momentum can take on an unlimited number of possible states."

I was thinking circular polarization as in microwave until I came upon this.

[hereandnow]

I was thinking the same thing but polarization has more than two states. There are only two circular polarization states but there are two other polarizations vertical and horizontal polarizations. I think the writer of this article has a weak background in Quantum physics and is using terms out of context...

[spunkets]

These are circularly polarized EM waves. The article is goofy.