摘要
Engineering spin polarization in dissipative bosonic systems is crucial for advancing quantum technologies,especially for applications in quantum metrology and space-based quantum simulations.This work demonstrates precise magnetic moment control in multicomponent Bose gases during evaporative cooling via tailored magnetic fields.By adjusting the magnetic field gradients,null point position,and duration,we selectively tune evap-oration rates of magnetic sublevels,achieving targeted spin polarization.Theoretical models,validated by numerical simulations and Stern–Gerlach experiments,reveal how magnetic fields reshape trapping poten-tials and spin-dependent dissipation.The results establish a dissipative spin-selection mechanism governing polarization evolution in evapora-tively cooled Bose gases and provide a framework for engineering spin-polarized quantum states.
基金
supported by the National Key Research and Development Program of China(Grant Nos.2021YFA0718300 and 2021YFA1400900)
the National Natural Science Foundation of China(Grant Nos.11920101004,11934002,92365208)
the Space Application System of China Manned Space Program。
