3 ms·
In what sense is that not true? It seems true at least if we accept that a pure state is a mixture of itself with nothing else. Any quantum state CAN be repre
by kgwgk 4y ago
In what sense is that not true?
It seems true at least if we accept that a pure state is a mixture of itself with nothing else.
Any quantum state CAN be represented by a density matrix. That's what density matrices are for. That quantum state may be pure or may be a mixture. (A mixture density matrix could also be a partial trace representing a subsystem of a larger system instead of a true mixture of pure states.)
- tgflynn 4y agoYes, I you're right. I misinterpreted "pure quantum states" as "basis states" (I'm not much in the habit of thinking about QM these days). I believe the "(i.e. as a density matrix)", which makes my mistake more obvious, was added after I commented.