A Fermi-degenerate three-dimensional optical lattice clock
A Fermi-degenerate three-dimensional optical lattice clock
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DOI：
10.1126/science.aam5538
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发表时间：
2017-10-06
期刊：
影响因子：
56.9
通讯作者：
Ye, J.
中科院分区：
文献类型：
--
作者：
Campbell, S. L.;Hutson, R. B.;Ye, J.
锶光学晶格钟具有同时询问数百万个原子的潜力，具有4x10(17)的高光谱品质因数。此前，原子相互作用迫使在时钟稳定性和精确度之间做出妥协，前者受益于大量原子，后者受制于密度相关的频率漂移。在这里，我们展示了一种可扩展的解决方案，它利用三维(3D)光学晶格中简并费米气体的高关联密度来防止现场相互作用的移动。我们表明，接触相互作用得到了解决，因此它们对时钟漂移的贡献比以前的实验低了一个数量级。3D晶格的两个区域之间的同步时钟比较在1小时的平均时间内产生5x10(-19)的测量精度。
Strontium optical lattice clocks have the potential to simultaneously interrogate millions of atoms with a high spectroscopic quality factor of 4 x 10(17). Previously, atomic interactions have forced a compromise between clock stability, which benefits from a large number of atoms, and accuracy, which suffers from density-dependent frequency shifts. Here we demonstrate a scalable solution that takes advantage of the high, correlated density of a degenerate Fermi gas in a three-dimensional (3D) optical lattice to guard against on-site interaction shifts. We show that contact interactions are resolved so that their contribution to clock shifts is orders of magnitude lower than in previous experiments. A synchronous clock comparison between two regions of the 3D lattice yields a measurement precision of 5 x 10(-19) in 1 hour of averaging time.