Gardiner's phonon for Bose-Einstein Condensation: A physical realization of the $q$-deformed Boson

C. P. Sun, S. X. Yu, Y. B. Gao

The Gardiner's phonon presented for a particle-number conserving approximation method to describe the dynamics of Bose-Einstein Condesation (BEC) (C.W. Gardiner, Phys. Rev. A 56, 1…