Systematic evaluation of an atomic clock at 2e-18 total uncertainty

Abstract

The pursuit of better atomic clocks has advanced many research areas, providing better quantum state control, new insights in quantum science, tighter limits on fundamental constant variation, and improved tests of relativity. The record for the best stability and accuracy is currently held by optical lattice clocks. This work takes an important step towards realizing the full potential of a many-particle clock with a state-of-the-art stable laser. Our 87Sr optical lattice clock now achieves fractional stability of 2.2e-16 at 1 s. With this improved stability, we perform a new accuracy evaluation of our clock, reducing many systematic uncertainties that limited our previous measurements, such as those in the lattice ac Stark shift, the atoms' thermal environment, and the atomic response to room-temperature BBR. Our combined measurements have reduced the total uncertainty of the JILA Sr clock to 2.1e-18 in fractional frequency units.

Full published version

References in corpus (14)

• Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock
• Frequency ratio of two optical clock transitions in ${}^{171}$Yb${}^{+}$ and constraints on the time-variation of fundamental constants
• Quantum State Engineering and Precision Metrology using State-Insensitive Light Traps
• Spectroscopic observation of SU(N)-symmetric interactions in Sr orbital magnetism
• Observation of two-orbital spin-exchange interactions with ultracold SU(N)-symmetric fermions
• Improved limit on a temporal variation of $m_p/m_e$ from comparisons of Yb${}^{+}$ and Cs atomic clocks
• Multipolar theory of black-body radiation shift of atomic energy levels and its implications for optical lattice clocks
• ${}^{87}$Sr lattice clock with inaccuracy below 10${}^{-15}$
• Optical atomic coherence at the one-second time scale
• High accuracy correction of blackbody radiation shift in an optical lattice clock
• An atomic clock with $1\times 10^{-18}$ room-temperature blackbody Stark uncertainty
• Improved frequency measurement of a one-dimensional optical lattice clock with a spin-polarized fermionic ${}^{87}$Sr isotope
• Determination of the 5d6s 3D1 state lifetime and blackbody radiation clock shift in Yb
• Thermometry via Light Shifts in Optical Lattices

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