Zurek’s envariance derivation of Born’s rule and measurement
Serbian Academy of Sciences and Arts, Knez Mihajlova 35, 11000, Belgrade, Serbia
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Revised: 20 October 2011
Accepted: 10 January 2012
Published online: 7 February 2012
Zurek’s derivation of Born’s rule using envariance (invariance due to entanglement) is considered to capture the probability in full generality, but only as applied to the measurement of a quantum observable. Contrariwise, textbook formulations of Born’s rule begin with a pure state of a closed, undivided system. The task of this study is to show that a rearrangement of the Zurek approach is possible in which the latter is viewed as giving the probabilities for Schmidt states of an arbitrary composite state vector, and afterwards it is extended to probabilities in a closed, undivided system. This is achieved by determining simultaneously probability and measurement based on the fact that the physical meaning of probability and that of measurement are inextricably dependent on each other.
© Società Italiana di Fisica and Springer, 2012