A pseduomixture of states is an affine combination of states, i.e.
| ρ = | ∑ | rjρj |
| j |
where
| ∑ | rj = 1 |
| j |
and the rj are real.
This is different from a mixture of states in that for a mixture, the rj have to be non-negative.
See also
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