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Recall that in Chapter 5 the concept of phase space was introduced for the description of a classical system. A single point of phase space would be used to represent the (classical) state of an entire physical system. In the quantum theory, the appropriate analogous concept is that of a Hilbert space. A single point of Hilbert space now represents the quantum state of an entire system.
page 257 in "The Emperors new Mind" by R. Penrose
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