In:
Quantum Information and Computation, Rinton Press, Vol. 13, No. 3&4 ( 2013-3), p. 266-280
Abstract:
We present a detailed analysis of spin squeezing of the one-axis twisting model with a many-body phase dephasing, which is induced by external field fluctuation in a two-mode Bose-Einstein condensates. Even in the presence of the dephasing, our analytical results show that the optimal initial state corresponds to a coherent spin state $|\theta_{0}, \phi_0\rangle$ with the polar angle $\theta_0=\pi/2$. If the dephasing rate $\gamma\ll S^{-1/3}$, where $S$ is total atomic spin, we find that the smallest value of squeezing parameter (i.e., the strongest squeezing) obeys the same scaling with the ideal one-axis twisting case, namely $\xi^2\propto S^{-2/3}$. While for a moderate dephasing, the achievable squeezing obeys the power rule $S^{-2/5}$, which is slightly worse than the ideal case. When the dephasing rate $\gamma 〉 S^{1/2}$, we show that the squeezing is weak and neglectable.
Type of Medium:
Online Resource
ISSN:
1533-7146
,
1533-7146
DOI:
10.26421/QIC13.3-4-7
Language:
Unknown
Publisher:
Rinton Press
Publication Date:
2013
SSG:
24,1
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