Robust Ramsey sequences with Raman adiabatic rapid passage
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PhysRevA.90.053611.pdf
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672.62 KB
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Author(s)
Kotru, Krish
Brown, Justin M.
Butts, David L.
Kinast, Joseph M.
Stoner, Richard E.
Date Issued
November 2014
Journal
Physical Review A
Publisher
American Physical Society
Citation
Kotru, Krish, Justin M. Brown, David L. Butts, Joseph M. Kinast, and Richard E. Stoner. “Robust Ramsey Sequences with Raman Adiabatic Rapid Passage.” Phys. Rev. A 90, no. 5 (November 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We present a method for robust timekeeping in which alkali-metal atoms are interrogated in a Ramsey sequence based on stimulated Raman transitions with optical photons. To suppress systematic effects introduced by differential ac Stark shifts and optical intensity gradients, we employ atom optics derived from Raman adiabatic rapid passage (ARP). Raman ARP drives coherent transfer between the alkali-metal hyperfine ground states via a sweep of the Raman detuning through the two-photon resonance. Our experimental implementation of Raman ARP reduced the phase sensitivity of Ramsey sequences to Stark shifts in [superscript 133]Cs atoms by about two orders of magnitude, relative to fixed-frequency Raman transitions. This technique also preserved Ramsey fringe contrast for cloud displacements reaching the 1/e[superscript 2] intensity radius of the laser beam. In a magnetically unshielded apparatus, second-order Zeeman shifts limited the fractional frequency uncertainty to ~3.5 × 10[superscript −12] after about 2500 s of averaging.
MIT Department
Charles Stark Draper Laboratory
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.90.053611
