In quantum mechanics Definition and 256 Threads

I was just thinking how photons fit into QM, I've heard people speak of "photon wavefunctions". In particular I am wondering whether its bound by the Uncertainty priciple, I guess it can't be... since we know its exact velocity (i.e delta(x) = 0, at least in a 1-d case =P) how could we...

I've always though of particles in the following sense: If you do NOT measure/decohere a particle in some way, it exists ONLY as a probability wave--there is no "actual" number for each of its unknown quantity, just a probability of what it will be. There are no "hidden variables" that we...

Newton was separate from his clockwork universe; in the last century we have realized that we experimenters really subjectify the outcome of our experiment by attempting to exclude ourselves from it. Both quantum mechanics and cosmology involve an observer who participates by disturbing an...

As in quantum mechanics a photon can find itself at 2 different places at the same time, does time then exists at that level ?

Hi, I am a high school student, and I am planning on going into quantum computers as a profession. However I have failed so far to find any resources or teachers, organized in any fashion to help me to get a head start on the subject before I have to tackle it in college. I feel it is very...

There's a problem in Liboff's text "Introductory Quantum Mechanics - 3rd Ed." On page 176 problem 6.12 states "A particle moving in one dimension interacts with a potential V(x). In a stationary state of this system show that (1/2) <x dV/dx > = <T> where T = p^2/2m is the kinetic...