Probing two-particle exchange processes in two-mode Bose-Einstein condensates

Luis Benet, Diego Espitia, Daniel Sahagún
2017 Physical Review A  
We study the fidelity decay and its freeze for an initial coherent state of two-mode Bose-Einstein condensates in the Fock regime considering a Bose-Hubbard model that includes two-particle tunneling terms. By using linear-response theory we find scaling properties of the fidelity as a function of the particle number that prove the existence of two-particle mode-exchange when a non-degeneracy condition is fulfilled. Tuning the energy difference of the two modes serves to distinguish the
more » ... of two-particle mode-exchange terms through the appearance of certain singularities. Numerical results confirm our findings. Experimental verification of our findings could improve cold atom interferometry.
doi:10.1103/physreva.95.033624 fatcat:x3dsez5uzjhsrpikthu2gzty6i