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Quantum Physics via Quantum Tomography: A New Approach to Quantum Mechanics
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[QUOTE="A. Neumaier, post: 6587513, member: 293806"] It is a preparation, but not one to which Born's rule applies. Born's rule is valid only if the ensemble consists of[B] independent and identically prepared[/B] states. You need independence because e.g., immediately repeated position measurements of a particle do not respect Born's rule, and you need identical prepartion because there is only one state in Born's formula. In the case under discussion, one may interpret the situation as reeated preparation, as you say. But unless the system is stationary (and hence uninteresting in the context of the experiment under discussion), the state prepared before the ##k##th measurement is different for each ##k##. Moreover, due to the preceding measurement this state is only inaccurately known and correlated with the preceding one. Thus the ensemble prepared consists of [B]nonindependent and nonidentically prepared[/B] states, for which Born's rule is silent. [/QUOTE]
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Quantum Physics via Quantum Tomography: A New Approach to Quantum Mechanics
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