A couple of entanglment questions

[tj8888]

Hi, I have some brief questions I was hoping to get some help with:

1. Can any aspect of entanglement survive measurement? What I mean is, does the so-called collapse of the wave function in some sense delete any previous entanglements?

2. Does every event (particle interactions) result in some sort of entanglement?

thanks.

 

[Forestman]

There might be something in here that could help you.

http://en.wikipedia.org/wiki/Quantum_entanglement

 

[DrChinese]

Hi, I have some brief questions I was hoping to get some help with:

1. Can any aspect of entanglement survive measurement? What I mean is, does the so-called collapse of the wave function in some sense delete any previous entanglements?

1. Yes, entanglement can "sometimes" survive measurement. There are a couple of specific situations I can think of, they are a bit exotic:

a) Erasure of the measurement can restore an entangled state.
b) A measurement of one entangled property (say spin) which does not yield any information about a commuting property (say position) will not affect the second property's entanglement.