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Lattice-induced frequency shifts in Sr optical lattice clocks at the 10(-17) level.

Authors
  • Westergaard, P G
  • Lodewyck, J
  • Lorini, L
  • Lecallier, A
  • Burt, E A
  • Zawada, M
  • Millo, J
  • Lemonde, P
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
May 27, 2011
Volume
106
Issue
21
Pages
210801–210801
Identifiers
PMID: 21699284
Source
Medline
License
Unknown

Abstract

We present a comprehensive study of the frequency shifts associated with the lattice potential in a Sr lattice clock by comparing two such clocks with a frequency stability reaching 5×10(-17) after a 1 h integration time. We put the first experimental upper bound on the multipolar M1 and E2 interactions, significantly smaller than the recently predicted theoretical upper limit, and give a 30-fold improved upper limit on the effect of hyperpolarizability. Finally, we report on the first observation of the vector and tensor shifts in a Sr lattice clock. Combining these measurements, we show that all known lattice related perturbations will not affect the clock accuracy down to the 10(-17) level, even for lattices as deep as 150 recoil energies.

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