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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

Lattice Light Shift Evaluations In a Dual-Ensemble Yb Optical Lattice Clock

Author(s)
Tobias Bothwell, Roger Brown, Benjamin Hunt, Jacob Siegel, Tanner Grogan, Youssef Hassan, Kyle Beloy, Andrew Ludlow, Kurt Gibble, Takumi Kobayashi, Marianna Safronova, Sergey Porsev
In state-of-the-art optical lattice clocks, beyond-electric-dipole polarizability terms lead to a break-down of magic wavelength trapping. In this Letter, we

Deployment of a Transportable Yb Optical Lattice Clock

Author(s)
Tobias Bothwell, Tanner Grogan, Marco Pomponio, Takuma Nakamura, Craig Nelson, Archita Hati, Franklyn Quinlan, Andrew Ludlow, Wesley Brand, Robert Fasano, Yun-Jhih Chen, Thomas Akin, Joseph Whalen, Richard Fox, ignacio baldoni, Benjamin Rauf, michele giunta, ronald holzwarth, Steven Peil

Ratchet Loading and Multi-Ensemble Operation in an Optical Lattice Clock

Author(s)
Youssef Hassan, Takumi Kobayashi, Tobias Bothwell, Jacob Siegel, Benjamin Hunt, Kyle Beloy, Kurt Gibble, Tanner Grogan, Andrew Ludlow
We demonstrate programmable control over the spatial distribution of ultra-cold atoms confined in an optical lattice. The control is facilitated through a

Clock-line-mediated Sisyphus Cooling

Author(s)
Jacob Siegel, Benjamin Hunt, Tanner Grogan, Youssef Hassan, Kyle Beloy, Roger Brown, Andrew Ludlow, Chun-Chia Chen, Kurt Gibble
We demonstrate sub-recoil Sisyphus cooling using the long-lived 3P0 clock state in alkaline-earthlike ytterbium. A 1388 -nm optical standing wave nearly

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
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