Comment #6 on issue 3199 by [email protected]: Finish implementing density operator/matrix
http://code.google.com/p/sympy/issues/detail?id=3199
When applying operators to density matrices, the operators need to act on both the L and R sides. We could create a special method of the density op class that applies an operator to the L and R sides. We would need to think a bit about the best way of integrating that with the qapply logic we have in place.
This option should be achievable baring some tweaks that we may need. In the qapply_Mul() function in qapply.py, we could check if the exp has only 2 args ( any operator and an density op). In that case, we apply the L and R operation to this, and return an densityop as a result. That way the densityop will be preserved for subsequent qapply operations.
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