论文标题
通过磁场旋转的张量频率移动的相干抑制
Coherent suppression of tensor frequency shifts through magnetic field rotation
论文作者
论文摘要
我们引入了一种方案，以连贯抑制原子钟中的二等张量频移，并依赖于在Ramsey序列中自由原子状态进化过程中外部磁场的连续旋转。该方法在单个审讯周期内检索未扰动的频率，并且很容易适用于各种原子时钟系统。对于由于二极管相互作用而引起的频移，我们在实验上证明了$ {}^2S_ {1/2} \ to {}^2d_ {3/2} $过渡单个被困$ {}^}^{171}^{171}^{171}^{171}^{171}^{yb}^yb}^yb}^+II的us {}^2s_ {1/2} \ to {}^2d_ {3/2} $ to sudmissions的抑制。该方案在$ {}^{171} \ text {yb}^+$ $ {}^2S_ {1/2} \ to {}^2f_ {7/2} $ electric Octupole（e3）过渡的情况下提供了特定优势。为了改进对这种过渡的残留四极偏移的估计，我们测量激发的状态四极矩$θ（{}^2d_ {3/2}）= 1.95（1）〜EA_0^2 $和$θ（}（}}^2f_ {7/2}^2f_ {7/2}）= -0.0297（5） $ a_0 $ bohr半径，将测量不确定性提高一个数量级。
We introduce a scheme to coherently suppress second-rank tensor frequency shifts in atomic clocks, relying on the continuous rotation of an external magnetic field during the free atomic state evolution in a Ramsey sequence. The method retrieves the unperturbed frequency within a single interrogation cycle and is readily applicable to various atomic clock systems. For the frequency shift due to the electric quadrupole interaction, we experimentally demonstrate suppression by more than two orders of magnitude for the ${}^2S_{1/2} \to {}^2D_{3/2}$ transition of a single trapped ${}^{171}\text{Yb}^+$ ion. The scheme provides particular advantages in the case of the ${}^{171}\text{Yb}^+$ ${}^2S_{1/2} \to {}^2F_{7/2}$ electric octupole (E3) transition. For an improved estimate of the residual quadrupole shift for this transition, we measure the excited state electric quadrupole moments $Θ({}^2D_{3/2}) = 1.95(1)~ea_0^2$ and $Θ({}^2F_{7/2}) = -0.0297(5)~ea_0^2$ with $e$ the elementary charge and $a_0$ the Bohr radius, improving the measurement uncertainties by one order of magnitude.
