Trapped ion approach to miniaturizing high performance atomic clocks

Trapped ions are a promising approach to low-SWaP, high-performance atomic clocks. Here, we discuss different approaches of trapped ion atomic clocks under development at JPL aimed at reducing the size and power while maintaining performances. We will focus on the micro-mercury trapped ion microwave clock and a single trapped ytterbium ion optical clock. We will also mention some of the efforts in investigating the feasibility of realizing integrated-photonic chip optical clock with multiple trapped ions.