Quantum-Logic Clock with a Systematic Uncertainty below
Jul 15, 20196 pages
Published in:
- Phys.Rev.Lett. 123 (2019) 3, 033201
- Published: Jul 15, 2019
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Abstract: (APS)
We describe an optical atomic clock based on quantum-logic spectroscopy of the 1S0↔3P0 transition in 27Al+ with a systematic uncertainty of 9.4×10−19 and a frequency stability of 1.2×10−15/√τ. A 25Mg+ ion is simultaneously trapped with the 27Al+ ion and used for sympathetic cooling and state readout. Improvements in a new trap have led to reduced secular motion heating, compared to previous 27Al+ clocks, enabling clock operation with ion secular motion near the three-dimensional ground state. Operating the clock with a lower trap drive frequency has reduced excess micromotion compared to previous 27Al+ clocks. Both of these improvements have led to a reduced time-dilation shift uncertainty. Other systematic uncertainties including those due to blackbody radiation and the second-order Zeeman effect have also been reduced.- Atomic, Molecular & Optical
- Atomic, optical & lattice clocks
- Time & frequency standards
- Atom & ion trapping & guiding
- Optical spectroscopy
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