Entangled wave function solved perturbatively

[friend]

Can the wave function for entangled particles be solved perturbatively? Are there virtual processes involved with this? Thanks again.

 

[Demystifier]

The question does not make sense. A wave function is not something that has to be solved. Schrödinger equation is something that has to be solved, and the wave function is its solution.

That being said, to compute the entangled wave function, perturbation theory and virtual processes may sometimes be useful, but often they are not needed at all.