Wei Yuan-Fei, Chao Si-Jia, Cui Kai-Feng, Li Cheng-Bin, Yu Shi-Cheng, Zhang Han, Shu Hua-Lin, Cao Jian, Huang Xue-Ren
Key Laboratory of Atom Frequency Standards, Innovation Academy for Precision Measurement Science and Technology, <a href="https://ror.org/034t30j35">Chinese Academy of Sciences</a>, Wuhan 430071, China.
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, <a href="https://ror.org/034t30j35">Chinese Academy of Sciences</a>, Wuhan 430071, China.
Phys Rev Lett. 2024 Jul 19;133(3):033001. doi: 10.1103/PhysRevLett.133.033001.
We present a novel approach for measuring the differential static scalar polarizability of a target ion utilizing a "polarizability scale" scheme with a reference ion co-trapped in a linear Paul trap. The differential static scalar polarizability of the target ion can be precisely extracted by measuring the ratio of the ac Stark shifts induced by an add-on infrared laser shed on both ions. This method circumvents the need for the calibration of the intensity of the add-on laser, which is usually the bottleneck for measurements of the polarizability of trapped ions. As a demonstration, ^{27}Al^{+} (the target ion) and ^{40}Ca^{+} (the reference ion) are used in this work, with an add-on laser at 1068 nm injected into the ion trap along the trap axis. The differential static scalar polarizability of ^{27}Al^{+} is extracted to be 0.416(14) a.u. by measuring the ratio of the ac Stark shifts of both ions. Compared to the most recent result [Phys. Rev. Lett. 123, 033201 (2019)PRLTAO0031-900710.1103/PhysRevLett.123.033201], the relative uncertainty of the differential static scalar polarizability of ^{27}Al^{+} is reduced by approximately a factor of 4, to 3.4%. This improvement is expected to be further enhanced by using an add-on laser with a longer wavelength.
我们提出了一种新颖的方法，用于测量目标离子的差分静态标量极化率，该方法利用一种“极化率标度”方案，将参考离子共捕获在一个线性保罗阱中。通过测量照射在两个离子上的附加红外激光所引起的交流斯塔克位移的比值，可以精确提取目标离子的差分静态标量极化率。这种方法避免了对附加激光强度进行校准的需要，而附加激光强度校准通常是捕获离子极化率测量的瓶颈。作为演示，在这项工作中使用了(^{27}Al^{+})（目标离子）和(^{40}Ca^{+})（参考离子），并将一束波长为(1068)纳米的附加激光沿阱轴注入离子阱。通过测量两个离子的交流斯塔克位移的比值，提取出(^{27}Al^{+})的差分静态标量极化率为(0.416(14))原子单位。与最新结果[《物理评论快报》123, 033201 (2019)PRLTAO0031 - 900710.1103/PhysRevLett.123.033201]相比，(^{27}Al^{+})的差分静态标量极化率的相对不确定度降低了约4倍，降至(3.4%)。预计通过使用波长更长的附加激光，这种改进将进一步提高。
