11. Such is the mixed state of the Red Sox bullpen. 12. A mixed state is different from a quantum superposition. 13. When a mixed state has rank 1, it therefore describes a " pure ensemble ". 14. This will be true, in the appropriate sense, for the mixed state case as well. 15. In "'Tuc01b "', he calculated CMI entanglement analytically, for a mixed state of two qubits. 16. In general, finding out whether or not a mixed state is entangled is considered difficult. 17. These two ensembles are completely indistinguishable experimentally, and therefore they are considered the same mixed state . 18. They're called " pure " to distinguish them from mixed states , which are another thing entirely. 19. "You get mixed states where you have depressive symptoms and manic symptoms at the same time. 20. Mixed states are described by so-called density matrices.