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Spin Squeezing of One-Axis Twisting Model in The Presence of Phase Dephasing
- Source :
- Quantum Information and Computation, Vol. 13, No. 3&4 (2013) 0266-0280
- Publication Year :
- 2013
-
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.<br />Comment: 14.2pages, 3 figures
- Subjects :
- Quantum Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Quantum Information and Computation, Vol. 13, No. 3&4 (2013) 0266-0280
- Publication Type :
- Report
- Accession number :
- edsarx.1312.3743
- Document Type :
- Working Paper