27Al+ Quantum-Logic Clock with a Systematic Uncertainty below 10-18
27Al+ Quantum-Logic Clock with a Systematic Uncertainty below 10-18
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DOI：
10.1103/physrevlett.123.033201
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发表时间：
2019-07-15
影响因子：
8.6
通讯作者：
Leibrandt, D. R.
中科院分区：
文献类型：
--
作者：
Brewer, S. M.;Chen, J-S;Leibrandt, D. R.
本文描述了一种基于Al-27（+）中S-1（0）-> P-3（0）跃迁的量子逻辑光谱的光学原子钟，其系统不确定度为9.4 × 10 ~（-19），频率稳定度为1.2 × 10 ~（-15）/根τ。Mg-25（+）离子与Al-27（+）离子同时被捕获，用于交感冷却和状态读出。在一个新的陷阱的改进，导致减少长期运动加热，与以前的Al-27（+）时钟，使时钟操作与离子长期运动附近的三维基态。与先前的Al-27（+）时钟相比，以较低的陷波驱动频率操作时钟减少了过多的微动。这两种改进都导致了时间膨胀移位不确定性的降低。其他系统的不确定性，包括那些由于黑体辐射和二阶塞曼效应也已减少。
We describe an optical atomic clock based on quantum-logic spectroscopy of the S-1(0) -> P-3(0) transition in Al-27(+) with a systematic uncertainty of 9.4 x 10(-19) and a frequency stability of 1.2 x 10(-15)/root tau.A Mg-25(+) ion is simultaneously trapped with the Al-27(+) ion and used for sympathetic cooling and state readout. Improvements in a new trap have led to reduced secular motion heating, compared to previous Al-27(+) clocks, enabling clock operation with ion secular motion near the three-dimensional ground state. Operating the clock with a lower trap drive frequency has reduced excess micromotion compared to previous Al-27(+) clocks. Both of these improvements have led to a reduced time-dilation shift uncertainty. Other systematic uncertainties including those due to blackbody radiation and the second-order Zeeman effect have also been reduced.