Magnetic-dipole transitions in highly-charged ions as a basis of ultra-precise optical clocks

Abstract

We evaluate the feasibility of using magnetic-dipole (M1) transitions in highly-charged ions as a basis of an optical atomic clockwork of exceptional accuracy. We consider a range of possibilities, including M1 transitions between clock levels of the same fine-structure and hyperfine-structure manifolds. In highly charged ions these transitions lie in the optical part of the spectra and can be probed with lasers. The most direct advantage of our proposal comes from the low degeneracy of clock levels and the simplicity of atomic structure in combination with negligible quadrupolar shift. We demonstrate that such clocks can have projected fractional accuracies below the $10^{-20}-10^{-21}$ level for all common systematic effects, such as black-body radiation, Zeeman, AC-Stark and quadrupolar shifts. Notice that usually-employed hyperfine clock transitions lie in the microwave spectral region. Our proposal moves such transitions to the optical domain. As the hyperfine transition frequencies depend on the fine-structure constant, electron-to-proton mass ratio, and nuclear magnetic moment, our proposal expands the range of experimental schemes for probing space and time variations of fundamental constants.

arXiv comment5 pages, 1 figure, accepted in PRL

References in corpus (10)

• An Optical Lattice Clock with Accuracy and Stability at the $10^{-18}$ Level
• Frequency Comparison of Two High-Accuracy Al+ Optical Clocks
• An atomic clock with $10^{-18}$ instability
• A Single-Ion Nuclear Clock for Metrology at the 19th Decimal Place
• Multipolar theory of black-body radiation shift of atomic energy levels and its implications for optical lattice clocks
• High-accuracy optical clock based on the octupole transition in 171Yb+
• Highly-charged ions as a basis of optical atomic clockwork of exceptional accuracy
• Highly-charged ions for atomic clocks, quantum information, and search for $\alpha$-variation
• Kilohertz-resolution spectroscopy of cold atoms with an optical frequency comb
• High-precision atomic clocks with highly charged ions: nuclear spin-zero $f^{12}$-shell ions

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