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arXiv 2008.07245quant-phcond-mat.quant-gas
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旋量玻色-爱因斯坦凝聚体腔增强磁强计

Cavity-enhanced magnetometer with a spinor Bose-Einstein condensate

Karol Gietka, Farokh Mivehvar, Thomas Busch

摘要:

我们提出了一种新型的复合轻物质磁强计的基础上横向驱动的多分量玻色-爱因斯坦凝聚体耦合到两个不同的电磁模式的线性腔。在临界泵浦强度以上,外加磁场引起的凝聚态粒子数不平衡的变化必然引起两个腔模的相对光子数的变化。因此,监测腔输出场允许实时无损测量磁场。我们表明,建议的磁力计的灵敏度表现出海森堡的缩放相对于原子数。对于国家的最先进的实验参数,我们计算出这样的磁力计的灵敏度的下限为fT/ $\sqrt{\mathrm{Hz}}$的顺序-pT/ $\sqrt{\mathrm{Hz}}$的凝聚体的$10^4$原子的相干时间的顺序为几毫秒。

英文摘要:

We propose a novel type of composite light-matter magnetometer based on a transversely driven multi-component Bose-Einstein condensate coupled to two distinct electromagnetic modes of a linear cavity. Above the critical pump strength, the change of the population imbalance of the condensate caused by an external magnetic field entails the change of relative photon number of the two cavity modes. Monitoring the cavity output fields thus allows for nondestructive measurement of the magnetic field in real time. We show that the sensitivity of the proposed magnetometer exhibits Heisenberg-like scaling with respect to the atom number. For state-of-the-art experimental parameters, we calculate the lower bound on the sensitivity of such a magnetometer to be of the order of fT/$\sqrt{\mathrm{Hz}}$--pT/$\sqrt{\mathrm{Hz}}$ for a condensate of $10^4$ atoms with coherence times of the order of several ms.

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