Xu Peng, Sun Huanying, Yi S, Zhang Wenxian
School of Physics and Technology, Wuhan University, Wuhan, Hubei, 430072, China.
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing, 100190, China.
Sci Rep. 2017 Oct 26;7(1):14102. doi: 10.1038/s41598-017-14442-5.
We investigate the process of spin squeezing in a ferromagnetic dipolar spin-1 Bose-Einstein condensate under the driven one-axis twisting scheme, with emphasis on the detrimental effect of noisy environments (stray magnetic fields) which completely destroy the spin squeezing. By applying concatenated dynamical decoupling pulse sequences with a moderate bias magnetic field to suppress the effect of the noisy environments, we faithfully reconstruct the spin squeezing process under realistic experimental conditions. Our noise-resistant method is ready to be employed to generate the spin squeezed state in a dipolar spin-1 Bose-Einstein condensate and paves a feasible way to the Heisenberg-limit quantum metrology.
我们研究了在驱动单轴扭转方案下，铁磁偶极自旋-1玻色-爱因斯坦凝聚体中的自旋压缩过程，重点关注噪声环境（杂散磁场）的有害影响，这种影响会完全破坏自旋压缩。通过应用带有适度偏置磁场的级联动态解耦脉冲序列来抑制噪声环境的影响，我们在实际实验条件下忠实地重建了自旋压缩过程。我们的抗噪声方法已准备好用于在偶极自旋-1玻色-爱因斯坦凝聚体中生成自旋压缩态，并为海森堡极限量子计量学铺平了一条可行的道路。
