We produce a rubidium Bose-Einsten-condesate (BEC) in a spherical optical dipole trap with a temperature of  about 50 nK. We transfer the orbital-angular momentum (OAM) of optical field to ultracold atoms using the Raman coupling technique. On this special system, we will explore exotic OAM states in quantum gases and their potential applications in quantum processing and precision measurment. Some research directions are summarized as follows.

1. Spin-orbital-angular-momentum coupling (SOAMC) of ultracold quantum gases.
2. Superposition and entanglement of OAM states in quantum gases.
3. Precision measurement of magnetic field using the OAM matter-wave interferometer. 

• Isotropic expansion of a spherical Bose condensate