Nonlinear particle interaction effects on Ramsey interferometry in an atom–heteronuclear molecule conversion system

Abstract

We investigate the Ramsey interferometry with a nonlinear atom–heteronuclear molecule conversion boson system, where the nonlinearity arises from the interaction between coherent atoms. In this coupled system, the nonlinear interaction between particles plays a significant role in a dynamic process. The nice Ramsey-type interference fringes in the time domain have been obtained when a sequence of two identical magnetic field pulses near the Feshbach resonance is applied. We show that a blue shift (or a red shift) of frequency of Ramsey-type fringes emerges due to the repulsive particle interaction (or the attractive particle interaction). In particular, we find that the visibility of Ramsey-type patterns can be strongly modified by the nonlinear particle interaction and a much higher visibility of Ramsey-type fringes can be accessed by tuning the Ramsey pulse duration appropriately.