Inspection of the Density Matrix

  • Thread starter Lamont1986
  • Start date
  • #1

Main Question or Discussion Point

I have a question about density matrices. Is there a way to deduce the purity of the density matrix just by inspection?

-L
 

Answers and Replies

  • #2
strangerep
Science Advisor
3,086
909
I have a question about density matrices. Is there a way to deduce the purity of the density matrix just by inspection?
I don't think you can deduce it just by inspection. One needs to at least
calculate [itex]\rho^2[/itex] and check that it has unit trace.
Cf. Ballentine pp 51-52.
 
Top