Optical clock intercomparison with $6\times 10^{-19}$ precision in one hour

By E. Oelker, R. Hutson, C. Kennedy, L. Sonderhouse, T. Bothwell, A. Goban, D. Kedar, C. Sanner, J. Robinson, G. E. Marti and 7 more. 2019

232 citations recorded by the source corpus.

Improvements in atom-light coherence are foundational to progress in quantum information science 1 , quantum optics 2 , and precision metrology 3 . Optical atomic clocks require local oscillators with exceptional optical coherence due to the challenge of performing spectroscopy on their ultra-narrow linewidth clock transitions. Advances in laser stabilization have thus enabled rapid progress in clock precision 4,5 . A new class of ultrastable lasers based on cryogenic silicon reference cavities 6 has recently demonstrated the longest optical coherence times to date 7 . In this work we utilize such a local oscillator, along with a state-of-the-art frequency comb for coherence transfer, with two Sr optical lattice clocks to achieve an unprecedented level of clock stability. Through an anti-synchronous comparison, the fractional instability of

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/47e83a59471167f04a1b1639dba0255c28f002ca