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Bulletin of the American Physical Society

Sensitive detection of spin flip using spin-mixing dynamics of 87 Rb Bose-Einstein condensates

Qi Liu, Ling-Na Wu, Yi-Quan Zou, Shuai-Feng Guo, Jiahao Cao, Meng Khoon Tey, Li You

Published May 29, 2018• 0 citations
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Bose-Einstein condensation of interacting spin-1 87^{87}87Rb atoms in an all-optical trap
We consider a small F=1F=1F=1 spinor condensate inside an optical cavity driven by an optical probe field, and subject the output of the probe to a homodyne detection, with the goal of investigating the effect of measurement backaction on the spin dynamics of the condensate. Using the stochastic master equation approach, we show that the effect of backaction is sensitive to not only the measurement strength but also the quantum fluctuation of the spinor condensate. The same method is also used to estimate the atom numbers below which the effect of backaction becomes so prominent that extracting spin dynamics from this cavity-based detection scheme is no longer practical.
We study the spin-mixing dynamics of an f=1f=1f=1 spinor condensate. We show that the dynamics is sensitive to the relative phase and particle number distribution among the individual components of the condensate, and find that complex structures can develop in the density profiles during the time evolution. We investigate the different time scales of the spin-mixing process and their dependence on the total particle number.