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oddthingy

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*mixed*system (also called a 'mixed ensemble'). Then suppose you can envisage a second system which is similar to the first, except that the energy eigenstates which each of the particles are in, are different.

Now finally imagine a system which is a quantum superposition of the following two systems; that is, it is a superposition of mixed states.

How would you define such a system in the language of quantum mechanics? For example, what would the density operator for this system be?