GEOMETRIC PHASE, QUANTUM MEASUREMENTS, AND THE DE-BROGLIE-BOHM MODEL

An approach to the measurement induced geometric phase based on the de Broglie-Bohm hidden-variable model is developed. The analysis involve s an evolving geometric phase connecting the initial and final states of an individual experimental run. As an illustration the geometric ph ase produced by a cyclic sequence of spin-1/2 filtering experiments is considered. It is argued, in this case, that the evolving geometric p hase can be made close to the Samuel-Bhandari phase.