2004/10/07 by Hon Man Wong, Kai Ming Cheng, M. -C. Chu
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.94.070406
published as Phys. Rev. Lett. 94, 070406 (2005)
arxiv created 2004/10/07 · arxiv updated 2009/12/01
We show that the geometric phase between any two states, including orthogonal states, can be computed and measured using the notion of projective measurement, and we show that a topological number can be extracted in the geometric phase change in an infinitesimal loop near an orthogonal state. Also, the Pancharatnam phase change during the passage through an orthogonal state is shown to be either π or zero (mod 2π). All the off-diagonal geometric phases can be obtained from the projective geometric phase calculated with our generalized connection.