Performance of a 229 Thorium solid-state nuclear clock
Author(s): G.A. Kazakov, A.N. Litvinov, V.I. Romanenko, L.P. Yatsenko, M. Schreitl, G. Winkler, Thorsten Schumm
Journal: New Journal of Physics
DOI Number: doi:10.1088/1367-2630/14/8/083019
Link: Link to publication
The 7.8 eV nuclear isomer transition in 229 thorium has been suggested as a clock transition in a new type of optical frequency standard.
Here we discuss the construction of a ‘solid-state nuclear clock’ from thorium
nuclei implanted into single crystals transparent in the vacuum ultraviolet
range. We investigate crystal-induced line shifts and broadening effects for the specific system of calcium fluoride. At liquid nitrogen temperatures, the clock performance will be limited by decoherence due to magnetic coupling of the thorium nuclei to neighboring nuclear moments, ruling out the commonly used Rabi or Ramsey interrogation schemes. We propose clock stabilization based on a fluorescence spectroscopy method and present optimized operation parameters.
Taking advantage of the large number of quantum oscillators under continuous interrogation, a fractional instability level of 10−19 might be reached within the solid-state approach.