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A model of quantum measurement, illustrated using the spin--boson model, isformulated in terms of a cascading pair of quantum phase transitions. The firstproduces the desired superposition of macroscopic responses to the microscopicstate under investigation, while the second provides a mechanism for subsequent"wavefunction collapse," suppressing superpositions of distinct macroscopicstates, producing instead a density matrix that implements the expectedclassical observation outcome via the Born probability rule. Motivated bynumerous carefully designed measurements that may occur during the course of aquantum computation, effects of entanglement are investigated when themeasurement is performed on only a subset of the microscopic degrees offreedom.

A quantum phase transition implementation of quantum measurement