Summary
When a state of a physical system dynamically changes to another state, it is important to know the correlation existing between the initial state and the final state. This correlation is described by a compound state (measure) in classical systems. In this note, we show a way how to construct such a compound state in quantum systems which is an extension of the classical compound state.
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Ohya, M. Note on quantum probability. Lett. Nuovo Cimento 38, 402–404 (1983). https://doi.org/10.1007/BF02789599
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DOI: https://doi.org/10.1007/BF02789599