Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Andrew Ludlow (Fed)

Andrew Ludlow is a physicist and leader of the Neutral Atom Optical Clock Group in the Physical Measurement Laboratory at the National Institute of Standards and Technology in Boulder. He is also a lecturer and adjoint professor at the University of Colorado Boulder, and a senior investigator in Q-SEnSE. His main research interests include the development of optical atomic clocks, cold atom systems for quantum metrology, ultrastable optical sources and laser interferometry, and the application of these systems to fundamental physics studies and advanced technology. He received a Ph.D. in Physics from the University of Colorado Boulder in 2008 and a B.S. in Physics from Brigham Young University in 2002. Andrew is a Fellow of the American Physical Society, and is the recipient of various awards for his research activity including the APS Pipkin Award, the Arthur S. Flemming Award, the Presidential Early Career Award, the EFTF Young Scientist Award, and the APS DAMOP Thesis Prize.

Publications

Optical clock frequency ratios with uncertainty ≤ 3.2 × 10^−18

Author(s)
Alexander Aeppli, Willa Arthur-Dworschack, Kyle Beloy, Caitlin Berry, Tobias Bothwell, Angela Folz, Tara Fortier, Tanner Grogan, Youssef Hassan, Zoey Zimeng Hu, David Hume, Benjamin Hunt, Kyungtae Kim, Amanda Koepke, Dahyeon Lee, David Ray Leibrandt, Ben Lewis, Andrew Ludlow, Mason Marshall, Nicholas Nardelli, Harikesh Ranganath, Daniel Rodriguez Castillo, Jeffrey Sherman, Jacob Siegel, Suzanne Thornton, William Warfield, Jun Ye
We report high-precision frequency ratio measurements between optical atomic clocks based on 27Al+, 171Yb, and 87Sr. With total fractional uncertainties at or

Blackbody radiation Zeeman shift in Rydberg atoms

Author(s)
Kyle Beloy, Benjamin Hunt, Roger Brown, Tobias Bothwell, Youssef Hassan, Jacob Siegel, Tanner Grogan, Andrew Ludlow
We consider the Zeeman shift in Rydberg atoms induced by room-temperature blackbody radiation (BBR). BBR shifts to the Rydberg levels are dominated by the

Patents (2018-Present)

Optical Reference Cavity

NIST Inventors
Franklyn Quinlan , Scott Diddams and Andrew Ludlow
An optical reference cavity includes: a cell that includes: a cylindrical body; end faces; an optical canal having an interior cylindrical geometry; and an exterior surface having an exterior cylindrical geometry; mirrors disposed on the end faces; an aspect ratio that is less than 1; a compression
Created May 31, 2018, Updated May 15, 2023
Was this page helpful?