距离不确定度为10^（-15）的深UV中性原子频率基准
A neutral atom frequency reference in the deep UV with 10^(-15) range uncertainty
摘要：
我们对199 Hg中的（6 s ^{2}）1 S 0->（6 s 7 s）3 P0时钟跃迁频率进行了评估，不确定性降低了近三个数量级，并证明原子品质因数Q约为10^（14）。199 Hg原子被限制在一个垂直的晶格陷阱中，光的波长为362.5697 +/-0.0011 nm，晶格深度为20 Er。原子从单级磁光阱加载，冷却光为253.7 nm。在265.6nm处用80 ms的Rabi脉冲获得高Q因子。时钟跳变频率为1 128 575 290 808 162.0 +/-6.4（sys.）+/-0.3（静态）Hz（分数不确定度= 5.7x10^（-15））。既没有原子数也没有二阶塞曼依赖尚未被检测到。只有三种激光波长用于冷却，晶格捕获，探测和检测。
英文摘要：
We present an assessment of the (6s^{2})1S0 -> (6s7s)3P0 clock transition frequency in 199Hg with an uncertainty reduction of nearly three orders of magnitude and demonstrate an atomic quality factor, Q, of ~10^(14). The 199Hg atoms are confined in a vertical lattice trap with light at the newly determined magic wavelength of 362.5697 +/-0.0011 nm and at a lattice depth of 20Er. The atoms are loaded from a single stage magneto-optical trap with cooling light at 253.7 nm. The high Q factor is obtained with an 80 ms Rabi pulse at 265.6 nm. The frequency of the clock transition is found to be 1 128 575 290 808 162.0 +/-6.4 (sys.) +/-0.3 (stat.) Hz (fractional uncertainty = 5.7x10^(-15)). Neither an atom number nor second order Zeeman dependence have yet to be detected. Only three laser wavelengths are used for the cooling, lattice trapping, probing and detection.
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