Statistics of the Bifurcation in Quantum Measurement

We model quantum measurement of a two-level system [Formula: see text]. Previous obstacles for understanding the measurement process are removed by basing the analysis of the interaction between [Formula: see text] and the measurement device on quantum field theory. This formulation shows how inverse processes take part in the interaction and introduce a non-linearity, necessary for the bifurcation of quantum measurement. A statistical analysis of the ensemble of initial states of the measurement device shows how microscopic details can influence the transition to a final state. We find that initial states that are efficient in leading to a transition to a final state result in either of the expected eigenstates for [Formula: see text] , with ensemble averages that are identical to the probabilities of the Born rule. Thus, the proposed scheme serves as a candidate mechanism for the quantum measurement process.