Superoperator on operator

[funda...@googlemail.com]

Hallo,

I want to code this: Psi(X)= A X B, so Psi is my superoperator and X my density matrix
So i definied in python (with qutip as qt):
 Psi= qt.sprepost(A,B)
 X=qt.rand_dm(3)
 (A and B with qt.rand_unitary(3))

How can i calculate Psi(X)?
I tryed Psi*X but that doesn´t work.

Thanks for help!

Greetings,
Daniel

[funda...@googlemail.com]

Any ideas?

[Paul Nation]

I am working on this at the moment.  In short, the super operators act on the density matrix as a vector, not a matrix.  Therefore, we need to know ahead of time that the operator is a density matrix and not some other type.  This should be addressed alongside another issue:

https://github.com/qutip/qutip/issues/474

in the next day or two.