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arXiv 1408.0944quant-phcond-mat.quant-gasphysics.atom-ph
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用Ramsey干涉测量旋量凝聚体的磁张量梯度

Magnetic tensor gradiometry using Ramsey interferometry of spinor condensates

A. A. Wood, L. M. Bennie, A. Duong, M. Jasperse, L. D. Turner, R. P. Anderson

摘要:

通过干涉测量两个空间分离的玻色-爱因斯坦凝聚体之间的相对相位,实现了磁张量梯度仪。我们进行同步拉姆齐干涉测量的近端$^{87}$ Rb自旋-1凝聚体在自由落体,并推断其相对拉莫尔相位-从而差分磁场强度-与共模相位噪声抑制超过$50\,\mathrm{dB}$。通过适当地偏置磁场和沿正交方向分离的BEC,我们测量的磁场梯度张量的环境和施加的磁场与标称精度的$30\,\mathrm{μG\,cm^{-1}}$和传感器体积的$2\times10^{-5}\,\mathrm{mm}^3$。我们预测的自旋投影噪声限制的磁能分辨率为$\hbar$为典型的塞曼相干时间的捕获凝聚与此计划,即使与固有的BEC实验的低测量占空比。

英文摘要:

We have realized a magnetic tensor gradiometer by interferometrically measuring the relative phase between two spatially separated Bose-Einstein condensates (BECs). We perform simultaneous Ramsey interferometry of the proximate $^{87}$Rb spin-1 condensates in freefall and infer their relative Larmor phase -- and thus the differential magnetic field strength -- with a common-mode phase noise suppression exceeding $50\,\mathrm{dB}$. By appropriately biasing the magnetic field and separating the BECs along orthogonal directions, we measure the magnetic field gradient tensor of ambient and applied magnetic fields with a nominal precision of $30\,\mathrm{μG\,cm^{-1}}$ and a sensor volume of $2\times10^{-5}\,\mathrm{mm}^3$. We predict a spin-projection noise limited magnetic energy resolution of order $\hbar$ for typical Zeeman coherence times of trapped condensates with this scheme, even with the low measurement duty cycle inherent to BEC experiments.

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