Phase randomization and typicality in the interference of two   condensates
  Interference is observed when two independent Bose-Einstein condensates expand and overlap. This phenomenon is typical, in the sense that the overwhelming majority of wave functions of the condensates, uniformly sampled out of a suitable portion of the total Hilbert space, display interference with maximal visibility. We focus here on the phases of the condensates and their (pseudo) randomization, which naturally emerges when two-body scattering processes are considered. Relationship to typicality is discussed and analyzed. 
Paolo Facchi, Hiromichi Nakazato, Saverio Pascazio, Francesco V. Pepe,   Golam Ali Sekh and Kazuya Yuasa
cond-mat.quant-gas quant-ph