Coincidence detection of photon pairs produced in parametric fluorescence, in conjunction with a Michelson interferometer in which one member of each pair acquired a geometrical phase due to a cycle in polarization states, has allowed the first observation of Berrys phase at the single-photon level. We have verified that each interfering photon was essentially in an n=1 Fock state, by means of a beam splitter following the interferometer combined with a triple-coincidence technique. The results can be interpreted in terms of a nonlocal collapse of the wave function.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical review letters|
|State||Published - 1991|
ASJC Scopus subject areas
- Physics and Astronomy(all)