Single-ion nuclear clock for metrology at the 19th decimal place.

  title={Single-ion nuclear clock for metrology at the 19th decimal place.},
  author={C. J. Campbell and Alexander G. Radnaev and Alexander M. Kuzmich and V. A. Dzuba and Victor V. Flambaum and Andrei Derevianko},
  journal={Physical review letters},
  volume={108 12},
The 7.6(5) eV nuclear magnetic-dipole transition in a single 229Th3+ ion may provide the foundation for an optical clock of superb accuracy. A virtual clock transition composed of stretched states within the 5F(5/2) electronic ground level of both nuclear ground and isomeric manifolds is proposed. It is shown to offer unprecedented systematic shift suppression, allowing for clock performance with a total fractional inaccuracy approaching 1×10(-19). 

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