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nomadreid
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A pure state can be interpreted as belonging to a system, but it can also be interpreted as belonging to a single particle (although the resulting probability is in respect to the system), and as I understand it, this is now the preferred interpretation. But in https://en.wikipedia.org/wiki/Quantum_state#Mixed_states, it is stated that "A mixed quantum state is a statistical ensemble of pure states" which makes it sound as if a mixed state is only a quality of systems of equations, and cannot be considered a property of a single particle as a pure state can. Is this correct?