Stroboscopic Backaction Evasion in a Dense Alkali-Metal Vapor
Stroboscopic Backaction Evasion in a Dense Alkali-Metal Vapor
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DOI：
10.1103/physrevlett.106.143601
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发表时间：
2011-04-05
影响因子：
8.6
通讯作者：
Romalis, M. V.
中科院分区：
文献类型：
--
作者：
Vasilakis, G.;Shah, V.;Romalis, M. V.
我们通过实验探索了在存在自旋交换弛豫的情况下热钾蒸气中原子自旋的量子非破坏测量。我们展示了一种通过探测光的频闪调制来规避反作用的新技术。通过这项技术，我们研究了自旋噪声作为自旋大于 1/2 的原子极化的函数，并与简单的理论模型取得了良好的一致性。我们指出，在具有快速自旋交换的系统中，自旋弛豫率随时间变化，可以通过使用量子非破坏测量来提高原子磁力测量的长期灵敏度。
We explore experimentally quantum nondemolition measurements of atomic spin in a hot potassium vapor in the presence of spin-exchange relaxation. We demonstrate a new technique for backaction evasion by stroboscopic modulation of the probe light. With this technique we study spin noise as a function of polarization for atoms with spin greater than 1/2 and obtain good agreement with a simple theoretical model. We point that, in a system with fast spin exchange, where the spin-relaxation rate is changing with time, it is possible to improve the long-term sensitivity of atomic magnetometry by using quantum nondemolition measurements.