Journal or Book Title
PHYSICAL REVIEW LETTERS
Spontaneous symmetry breaking (SSB) for Bose-Einstein condensates cannot treat phase off-diagonal effects, and thus cannot explain Bell inequality violations. We describe another situation that is beyond a SSB treatment: an experiment where particles from two (possibly macroscopic) condensate sources are used for conjugate measurements of the relative phase and populations. Off-diagonal phase effects are characterized by a “quantum angle” and observed via “population oscillations,” signaling quantum interference of macroscopically distinct states.
Mullin, WJ and Laloe, F, "Beyond Spontaneously Broken Symmetry in Bose-Einstein Condensates" (2010). PHYSICAL REVIEW LETTERS. 22.
Retrieved from https://scholarworks.umass.edu/physics_faculty_pubs/22