TY - JOUR
AU - Martha Bodine
AU - Jean-Daniel Deschênes
AU - Isaac Khader
AU - William Swann
AU - Holly Leopardi
AU - Kyle Beloy
AU - Tobias Bothwell
AU - Samuel Brewer
AU - Sarah Bromley
AU - Jwo-Sy Chen
AU - Scott Diddams
AU - Robert Fasano
AU - Tara Fortier
AU - David Hume
AU - Dhruv Kedar
AU - Colin Kennedy
AU - Amanda Koepke
AU - David Leibrandt
AU - Andrew Ludlow
AU - William McGrew
AU - William Milner
AU - Daniele Nicolodi
AU - Eric Oelker
AU - Thomas Parker
AU - John Robinson
AU - Jeffrey Sherman
AU - Jian Yao
AU - Jun Ye
AU - Xiaogang Zhang
AU - Nathan Newbury
AU - Laura Sinclair
AB - We use frequency comb-based optical two-way time-frequency transfer (O-TWTFT) to measure the optical frequency ratio of state-of-the-art ytterbium and strontium optical atomic clocks separated by a 1.5 km open-air path. Our free-space measurement is compared to a simultaneous measurement acquired via a noise-cancelled fiber link. Despite non-stationary, ps-level time-of-flight variations in the free-space link, ratio measurements obtained from the two links, averaged over 30.5 hours across six days, agree to 6×10−19, showing that O-TWTFT can support free-space atomic clock comparisons below the 10−18 level.
BT - Physical Review Research
DA - 2020-09
DO - 10.1103/PhysRevResearch.2.033395
N2 - We use frequency comb-based optical two-way time-frequency transfer (O-TWTFT) to measure the optical frequency ratio of state-of-the-art ytterbium and strontium optical atomic clocks separated by a 1.5 km open-air path. Our free-space measurement is compared to a simultaneous measurement acquired via a noise-cancelled fiber link. Despite non-stationary, ps-level time-of-flight variations in the free-space link, ratio measurements obtained from the two links, averaged over 30.5 hours across six days, agree to 6×10−19, showing that O-TWTFT can support free-space atomic clock comparisons below the 10−18 level.
PY - 2020
SE - 033395
EP - 033395
T2 - Physical Review Research
TI - Optical Atomic Clock Comparison through Turbulent Air
UR - https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.033395
VL - 2
ER -