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## Main Question or Discussion Point

According to author John Gribbin, the state vector, or [tex]\Psi[/tex], or "probability waves" (whatever you want to call it) travels at the speed of light:

My question is, how do we know [tex]\Psi[/tex] travels at the speed of light?

I had a look at John Cramer's article (see http://www.npl.washington.edu/npl/int_rep/tiqm/TI_toc.html [Broken]) but couldn't find any clues there.

*But all of this still applied only to electromagnetic radiation. The gian leap taken bhy John Cramer was to extend these ideas to the wave equations of quantum mechanics - the Schrodinger equation itself, and the equations describing the probability waves, which travel, like photons, at the speed of light.*[p. 235,__Schrodinger's Kittens and the Search for Reality__- a very good book, btw]My question is, how do we know [tex]\Psi[/tex] travels at the speed of light?

I had a look at John Cramer's article (see http://www.npl.washington.edu/npl/int_rep/tiqm/TI_toc.html [Broken]) but couldn't find any clues there.

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