1School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 2Science and Technology on Inertial Laboratory, Beihang University, Beijing 100191 3Beijing Academy of Quantum Information Sciences, Beijing 100193 4Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beijing 100191
Abstract：An elongated trap potential for cold atoms is designed based on a quadrupole-Ioffe configuration. Phase fluctuations in a Bose–Einstein condensate (BEC), which is confined by the trap, are studied. We simulate the atom density distribution induced by fluctuation after time of flight from this elongated trap potential and study the temperature measurement method related to the distribution. Furthermore, taking advantage of the tight confinement and radio frequency dressing technique, we propose a double well potential for splitting BECs. Our results are helpful for improving understanding of low-dimensional quantum gases and provide important guidance for atomic interferometry.
2019, Vol. 36 
