Inspection of the Density Matrix

  • Thread starter Lamont1986
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I have a question about density matrices. Is there a way to deduce the purity of the density matrix just by inspection?

-L
 

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  • #2
strangerep
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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.
 

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