821 citations · 2.9k across the 22 of their papers we have counts for
16 papers · 1 filter
Frequency Ratio Measurements with 18-digit Accuracy Using a Network of Optical Clocks
Boulder Atomic Clock Optical Network, Collaboration, : +35
Atomic clocks occupy a unique position in measurement science, exhibiting higher accuracy than any other measurement standard and underpinning six out of seven base units in the SI…
Demonstration of a time scale based on a stable optical carrier
William R. Milner, John M. Robinson, Colin J. Kennedy +13
We demonstrate a time scale based on a phase stable optical carrier that accumulates an estimated time error of ps over 34 days of operation. This all-optical time scale…
Towards Adoption of an Optical Second: Verifying Optical Clocks at the SI Limit
W. F. McGrew, X. Zhang, H. Leopardi +13
The pursuit of ever more precise measures of time and frequency is likely to lead to the eventual redefinition of the second in terms of an optical atomic transition. To ensure con…
Ultra-stable optical clock with two cold-atom ensembles
M. Schioppo, R. C. Brown, W. F. McGrew +10
Atomic clocks based on optical transitions are the most stable, and therefore precise, timekeepers available. These clocks operate by alternating intervals of atomic interrogation…
An atomic clock with room-temperature blackbody Stark uncertainty
K. Beloy, N. Hinkley, N. B. Phillips +7
The Stark shift due to blackbody radiation (BBR) is the key factor limiting the performance of many atomic frequency standards, with the BBR environment inside the clock apparatus…
An atomic clock with instability
N. Hinkley, J. A. Sherman, N. B. Phillips +6
Atomic clocks have been transformational in science and technology, leading to innovations such as global positioning, advanced communications, and tests of fundamental constant va…