Systematic frequency shifts in linear ion chains of a few 10−19 achievable
31.03.2020
Taking this step has become possible thanks to precision ion traps that were developed at PTB and allow relative systematic uncertainties of a few 10−19 to be achieved. Among other investigations, the micromotion of trapped ions was measured with nanometer resolution using a novel temporally and spatially resolved detection method. With this new method, the researchers were able to show that the micromotion-induced frequency shifts of every individual ion inside a linear crystal can be kept in the sub-mHz range. The results open up the path for novel ion clock concepts such as the use of entangled quantum states and the simultaneous operation of several clocks on a single chip.