2000-Times Repeated Imaging of Strontium Atoms in Clock-Magic Tweezer Arrays
2000-Times Repeated Imaging of Strontium Atoms in Clock-Magic Tweezer Arrays
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DOI：
10.1103/physrevlett.122.173201
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发表时间：
2019-05-01
影响因子：
8.6
通讯作者：
Endres, Manuel
中科院分区：
文献类型：
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作者：
Covey, Jacob P.;Madjarov, Ivaylo S.;Endres, Manuel
我们展示了存活概率为0.99932(8)和保真度为0.99991(1)的单原子分辨成像，使我们能够在镊子中重复进行数千次单原子的高保真成像。我们进一步观察了激光冷却超过7分钟的寿命，这比以前的镊子研究长了一个数量级。实验是在813.4 nm的镊子阵列中用锶原子进行的，这是时钟转换的魔力波长。调谐到这个波长是通过组合线上的非魔法西西弗斯冷却来实现的，这让我们几乎可以任意选择镊子的波长。我们发现，径向的单个非后向反射冷却光束足以减轻成像过程中的反冲加热。此外，这种冷却技术产生的温度低于5muK，通过释放和重新捕获来测量。最后，我们演示了时钟状态分辨检测，平均存活概率为0.996(1)，平均状态检测保真度为0.981(1)。我们的工作为碱土原子的大型无缺陷阵列的逐原子组装铺平了道路，在这种阵列中，重复询问时钟跃迁是一种迫在眉睫的可能性。
We demonstrate single-atom resolved imaging with a survival probability of 0.99932(8) and a fidelity of 0.99991(1), enabling us to perform repeated high-fidelity imaging of single atoms in tweezers thousands of times. We further observe lifetimes under laser cooling of more than seven minutes, an order of magnitude longer than in previous tweezer studies. Experiments are performed with strontium atoms in 813.4 nm tweezer arrays, which is at a magic wavelength for the clock transition. Tuning to this wavelength is enabled by off-magic Sisyphus cooling on the intercombination line, which lets us choose the tweezer wavelength almost arbitrarily. We find that a single not retroreflected cooling beam in the radial direction is sufficient for mitigating recoil heating during imaging. Moreover, this cooling technique yields temperatures below 5 mu K, as measured by release and recapture. Finally, we demonstrate clock-state resolved detection with average survival probability of 0.996(1) and average state detection fidelity of 0.981(1). Our work paves the way for atom-by-atom assembly of large defect-free arrays of alkaline-earth atoms, in which repeated interrogation of the clock transition is an imminent possibility.