Question

How does quantum physics violate the principle of locality?

Answer 1

Experiments have shown that quantum mechanically entangled particles must violate either the principle of locality or the form of philosophical realism known as counterfactual definiteness.

Answer 2

but is it really true that for example using quantum entanglement you can deliver information long distances (like some thousand light years distance) in an instant, meaning this also faster than lightspeed? or is it just some misconception or misunderstanding of quantum mechanics?

Answer 3

i think there's nothing faster than lightspeed, ithink it's just a misunderstanding.

Answer 4

http://www.youtube.com/watch?v=r_IfV9fkBhk&feature=player_detailpage#t=646s
This gives you an idea of what conservation of charge (or its breaking) will look like, and why 'jumpiness' is not allowed of charge.

You are right about quantum entanglement I think, but another example is this. Fire a single electron at a light-year huge wall (with nothing in the way (the wall could be small, but big is easier to demonstrate with)). There is a nonzero probability of it being everywhere. Imagine a row of people standing every metre or so on this wall. They will note if the photon hits their detectors on the wall. It fires off A's detector. Now by the conservation of charge no-one else can observe this electron, thus the 'signal' of 'no more electrons' travels to all the other detectors, despite the fact that if the signal traveled (only) at light speed it would just reach the others in a year's time.
This contradicts relativity, as 'simultaneously' you have a message go out, but in rel. you cannot say 'a and b happened at the same time', as http://en.wikipedia.org/wiki/Relativity_of_simultaneity
http://en.wikipedia.org/wiki/Lorentz_transformation
each observers' time axis goes screwy with added velocity. So if for one person the message is
for another it seems like
(where the double lines (for them everything on this line is simultaneous (90 degrees to time-axis))), as the message spreads backwards and forwards in time, but not simultaneously, so for them something could 'sneak under' and the electron appear, so you would have 2 electrons.

The jumpy natures of particles' positions due to the Heisenberg uncertainty principle does, though.

Answer 5

The electron 'sneaking under' in another's reference frames, as the message spreads out along the double lines.
If the people in both reference frames meet and bring their electrons with them, there will be 2.