Half-minute-scale atomic coherence and high relative stability in a tweezer clock
Half-minute-scale atomic coherence and high relative stability in a tweezer clock
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DOI：
10.1038/s41586-020-3009-y
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发表时间：
2020-12
期刊：
影响因子：
64.8
通讯作者：
A. Young;William J. Eckner;W. Milner;D. Kedar;M. Norcia;E. Oelker;N. Schine;Jun Ye;A. Kaufman
中科院分区：
文献类型：
--
作者：
A. Young;William J. Eckner;W. Milner;D. Kedar;M. Norcia;E. Oelker;N. Schine;Jun Ye;A. Kaufman
制备相同量子系统的大型、低熵、高相干系综是量子计量、模拟和信息等许多研究的基础。在这里，我们通过利用镊子捕获的碱土原子的有利特性来实现这些特征，同时引入一种新的混合方法来定制光势，以平衡可扩展性、高保真状态制备、位点分辨读出和原子相干性的保存。通过这种方法，我们在近似原子的集合中实现了超过秒的捕获和光时钟激发态寿命。这导致光学时钟跃迁上的半分钟尺度原子相干性，相应的质量因子远远超过。这些相干时间和原子序数将量子投影噪声的影响降低到与主要原子系统相当的水平，为镊子阵列内子集成之间的同步时钟比较提供了相对分数频率稳定性。当进一步与该系统中可用的微观控制和读出相结合时，这些结果为定制原子阵列中光学时钟跃迁的长寿命工程纠缠铺平了道路。
The preparation of large, low-entropy, highly coherent ensembles of identical quantum systems is foundational for many studies in quantum metrology, simulation, and information. Here, we realize these features by leveraging the favorable properties of tweezer-trapped alkaline-earth atoms while introducing a new, hybrid approach to tailoring optical potentials that balances scalability, high-fidelity state preparation, site-resolved readout, and preservation of atomic coherence. With this approach, we achieve trapping and optical clock excited-state lifetimes exceedingseconds in ensembles of approximatelyatoms. This leads to half-minute-scale atomic coherence on an optical clock transition, corresponding to quality factors well in excess of. These coherence times and atom numbers reduce the effect of quantum projection noise to a level that is on par with leading atomic systems, yielding a relative fractional frequency stability offor synchronous clock comparisons between sub-ensembles within the tweezer array. When further combined with the microscopic control and readout available in this system, these results pave the way towards long-lived engineered entanglement on an optical clock transition in tailored atom arrays.