Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00103 : Control the spin coherence of a spin-1 Bose-Einstein Condensate with dynamical decoupling approach
Author:
The coherence of spinor Bose-Einstein condensates (BECs) is
determined by the dynamically unstable collective modes.
Recently, Uhrig Dynamical Decoupling (UDD), a sequence containing
$n$ $\pi$-pulses, has been applied to eliminate the decoherence
of a qubit in the spin-boson (SB) model up to the order of
$\mathcal {O}$$(t^{n+1})$ and proved to be a universal method.
Stimulated by its promising power, we conjecture whether the UDD
sequence could also preserve the coherence of a spinor BEC by
modulating the spin exchange interaction through optical Feshbach
resonance. In this work, we theoretically analyze the effect of
UDD, periodic DD (PDD) and concatenated DD (CDD) to maintain the
coherence of a $^{87}$Rb spin-1 BEC and a scalar BEC. Our
numerical results show that the CDD, as $n$ increases, suppresses
the decoherence more than the other two DD sequences in both the
spinor and the scalar BECs. However, it is interesting that all
three sequences only remove the decoherence up to the same order
$\mathcal {O}$$(t)$. We further carry out analytical works for
the scalar BEC, which confirms our numerical results that UDD,
compared to the case of SB model, is not as superior as expected
at coherence control in BECs.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.103
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