Geometric phase in weak measurements
نویسنده
چکیده
Pancharatnam’s [1] notion of ‘in-phase’ is the underlying principle of the quantal geometric phase [2, 3]. It is based on the physical condition of maximal interference: the vector representatives |A〉 and |B〉 of two nonorthogonal quantal states A and B are in-phase if they produce a maximum in intensity when added. This amounts to the condition 〈B|A〉 > 0, and any deviation from it defines the Pancharatnam relative phase φBA as
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