# Is photon's direction entangled?

Consider a free electron, with photon, that runs to electron under some angle(as everybody says). Compton scattering is happening, and electron instantly reemits photon in different angle.

First, how can we talk about angle between electron, and entity, that even not a point, but has no coordinates at all? And how we can say about the direction of moving?

My assumption- when electron emits photon (like during the Compton scattering), photon's direction is undefined- entangled. It gains an exact value when something absorbs photon, before - photon moves in all direction at the same time.

Wondering the next, I remember that photon's coordinate is not localized, hence according uncertainty principle, momentum of photon is 100% known.

The only mind, is that, by meaning that we 100% know momentum means that we know the speed, but not direction.

In the other hand, the thing that says, that photon propagates in all direction is this

People also represents this classic Coulomb's field ripple as em wave, or photon, as you can see, it propagates immediately in all directions. Furthermore, if you play with moving charge field simulators, you can notice, that there is no cases when em wave propagates in one direction, there always be the opposite propagation.

I'm confused.

• Comments are not for extended discussion; this conversation has been moved to chat. – rob Sep 19 '18 at 7:33

• Direction or rather momentum is actually $\dfrac{dx}{dt}$ but never mind. I've edited question with an ultimate question. Please, if You can, complete Your answer – user205628 Sep 18 '18 at 17:57