We report an optical lattice clock with a total systematic uncertainty of 8.1×10−19 in fractional frequency units, representing the lowest uncertainty of any clock to date. The clock relies on interrogating the ultra-narrow 1S0→3P0 transition in a dilute ensemble of fermionic strontium atoms trapped in a vertically-oriented, shallow, one-dimensional optical lattice. With 105 atoms in Wannier-Stark eigenstates of this lattice, we measure record atomic coherence time and measurement precision reaching below 1×10−19 [arXiv:2109.12238]. Such clock precision, together with imaging spectroscopy, enables precise control of collisional shifts as well as the lattice light shift [arXiv:2201.05909, arXiv:2210.16374]. To address two remaining large systematic effects, we measure the second order Zeeman coefficient on the least magnetically sensitive clock transition, and we precisely determine the 5s4d 3D1 lifetime to reduce the dynamic black body radiation shift uncertainty. All other systematic effects have uncertainties below 1×10−19.
BT - Submitted N2 -We report an optical lattice clock with a total systematic uncertainty of 8.1×10−19 in fractional frequency units, representing the lowest uncertainty of any clock to date. The clock relies on interrogating the ultra-narrow 1S0→3P0 transition in a dilute ensemble of fermionic strontium atoms trapped in a vertically-oriented, shallow, one-dimensional optical lattice. With 105 atoms in Wannier-Stark eigenstates of this lattice, we measure record atomic coherence time and measurement precision reaching below 1×10−19 [arXiv:2109.12238]. Such clock precision, together with imaging spectroscopy, enables precise control of collisional shifts as well as the lattice light shift [arXiv:2201.05909, arXiv:2210.16374]. To address two remaining large systematic effects, we measure the second order Zeeman coefficient on the least magnetically sensitive clock transition, and we precisely determine the 5s4d 3D1 lifetime to reduce the dynamic black body radiation shift uncertainty. All other systematic effects have uncertainties below 1×10−19.
PY - 2024 T2 - Submitted TI - A clock with 8×10−19 systematic uncertainty UR - https://arxiv.org/abs/2403.10664 ER -