**Stephen P. King** (*stephenk1@home.com*)

*Tue, 01 Jun 1999 14:59:42 -0400*

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Vaughan's response to my query:

**attached mail follows:**

*>Would it be accurate to identify the probability density
*

*>matrix with a Chu space?
*

I don't know, I would have to see the definition of morphism of

probability density matrices first. Do they in fact transform, and if

so what is the definition of such a transformation?

*>What do you think would be the valuation of the k? [0,1]?
*

No, K would be the complex numbers. Only the diagonal entries of a

probability density matrix need be real, the off-diagonal entanglements

are arbitrary complex numbers.

Vaughan Pratt

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