Magnetic phases in a spinor Bose-Einstein condensate subject to weak measurement
Physics and Astronomy
Atomic, Molecular and Optical Physics
49th Annual Meeting of the American Physical Society Division of Atomic, Molecular and Optical Physics
Ft. Lauderdale, FL
Nondestructive imaging of spinor Bose-Einstein condensates (BEC) presents new opportunities for observing and manipulating macroscopic quantum phenomena in real time. In this talk I theoretically study harmonically trapped two-component BECs subject to weak measurement via phase contrast imaging. I discuss the application of weak measurement theory to spatially extended condensates and present a stochastic Gross-Pitaevskii equation for the condensate order parameter. I then examine the stability of spin-polarized and spin-unpolarized phases of the condensate subject to continuous weak measurement. Additionally, I demonstrate how weak measurement can be used to track the position of a domain wall between spin-polarized regions. I quantify the effects of measurement backaction on the stochastic dynamics of the domain wall and discuss how domain wall dynamics could be observed in experiment.
Hilary Hurst and I. B. Spielman. "Magnetic phases in a spinor Bose-Einstein condensate subject to weak measurement" 49th Annual Meeting of the American Physical Society Division of Atomic, Molecular and Optical Physics (2018).