Spin Polarization Control via Magnetic Field in Dissipative Bosonic Systems

TL;DR

This paper presents a method to control spin polarization in dissipative bosonic systems using tailored magnetic fields, enabling precise manipulation of quantum states for advanced quantum technologies.

Contribution

It introduces a novel magnetic field-based technique for selective spin polarization control in Bose gases during evaporative cooling, supported by theoretical and experimental validation.

Findings

Magnetic field gradients can selectively tune evaporation of spin sublevels.

Theoretical models accurately predict spin polarization dynamics.

Experimental results confirm controlled spin polarization in Bose gases.

Abstract

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 evaporation rates of magnetic sublevels, achieving targeted spin polarization. Theoretical models, validated by numerical simulations and Stern-Gerlach experiments, reveal how magnetic fields reshape trapping potentials and spin-dependent dissipation. The results establish a dissipative spin-selection mechanism governing polarization evolution in evaporatively cooled Bose gases and provide a framework for engineering spin-polarized quantum states.