Preserving coherent spin and squeezed spin states of a spin-1 Bose-Einstein condensate with rotary echoes
arXiv:1611.10135 · doi:10.1103/PhysRevA.94.053608
Abstract
A challenge in precision measurement with squeezed spin state arises from the spin dephasing due to stray magnetic fields. To suppress such environmental noises, we employ a continuous driving protocol, rotary echo, to enhance the spin coherence of a spin-1 Bose-Einstein condensate in stray magnetic fields. Our analytical and numerical results show that the coherent and the squeezed spin states are preserved for a significantly long time, compared to the free induction decay time, if the condition is met with the pulse amplitude and pulse width. In particular, both the spin average and the spin squeezing, including the direction and the amplitude, are simultaneously fixed for a squeezed spin state. Our results point out a practical way to implement quantum measurements based on a spin-1 condensate beyond the standard quantum limit.
arXiv comment8 pages, 6 eps color figures, RevTex 4
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