ION TRAP SYSTEM TOWARDS 176LU+ 3D2 CLOCK TRANSITION

The 176Lu+ ion has a unique property that it possesses multiple clock transitions. In combination with hyperfine averaging, two of these transitions (1S0 – 3D1 and 1S0 – 3D2) present both long lifetimes and low sensitivity to the electromagnetic environment. Fully characterizing both transitions allows for a frequency ratio measurement within a single ion, which serves as a well-defined performance metric. This thesis focuses on the development of a new ion trap system allowing for 3D1 clock comparison at the low 10-19 and the calibration of systematics for the 3D2 transition. The first part details the design, construction, and characterization of the upgraded trap system, which replaces the previous one limited by high heating rate. The new trap exhibits significantly reduced heating that permits a long Ramsey interrogation time, improved excess micromotion compensation, and precise characterization of trap rf magnetic field contributing to the ac Zeeman shift. The second part presents an evaluation of 3D2 systematics and the 3D2 g-factor measurements with a relative inaccuracy of 10-7. The g-factor results are used to extract the residual quadrupole moment of the 3D2 state arising from hyperfine-mediated effects, corresponding to a frequency shift at the low 10-19 level.

Author dc:creator

• ZHAO QI

• residual quadrupole moment
• precision measurement
• g-factor
• lutetium
• ion trap
• optical atomic clock

Licence

• https://scholarbank.nus.edu.sg/bitstreams/c954ec71-8990-4e7e-b94a-eb9625805452/download