A quantum measurement of the spin direction
G. M. D'Ariano, P. Lo Presti, M. F. Sacchi
Abstract
We give a first physical model for the quantum measurement of the spin direction. It is an Arthurs-Kelly model that involves a kind of magnetic-dipole interaction of the spin with three modes of radiation. We show that in a limit of infinite squeezing of radiation the optimal POVM for the measurement of the spin direction is achieved for spin 1/2.
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