E
Ethan Clements
Researcher at National Institute of Standards and Technology
Publications - 10
Citations - 523
Ethan Clements is an academic researcher from National Institute of Standards and Technology. The author has contributed to research in topics: Atomic clock & Spectroscopy. The author has an hindex of 4, co-authored 7 publications receiving 308 citations. Previous affiliations of Ethan Clements include University of Colorado Boulder.
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Journal ArticleDOI
^{27}Al^{+} Quantum-Logic Clock with a Systematic Uncertainty below 10^{-18}.
Samuel M. Brewer,Samuel M. Brewer,Jwo-Sy Chen,Jwo-Sy Chen,A. M. Hankin,A. M. Hankin,Ethan Clements,Ethan Clements,Chin-Wen Chou,David J. Wineland,David J. Wineland,David J. Wineland,David Hume,David R. Leibrandt,David R. Leibrandt +14 more
TL;DR: In this article, an optical atomic clock based on quantum-logic spectroscopy of the S 0↔ −3 P 0 transition in Al −+ was proposed, with a systematic uncertainty of 9.4×10 −19 and a frequency stability of 1.2×10−15 −15/sqrt[τ].
Journal ArticleDOI
Measurements of Al + 27 and Mg + 25 magnetic constants for improved ion-clock accuracy
Samuel M. Brewer,Samuel M. Brewer,Jwo-Sy Chen,Jwo-Sy Chen,K. Beloy,A. M. Hankin,A. M. Hankin,Ethan Clements,Ethan Clements,Chin-Wen Chou,W. F. McGrew,W. F. McGrew,Xiaogang Zhang,Xiaogang Zhang,R. J. Fasano,R. J. Fasano,Daniele Nicolodi,Holly Leopardi,Holly Leopardi,Tara M. Fortier,Scott A. Diddams,Scott A. Diddams,Andrew D. Ludlow,David J. Wineland,David J. Wineland,David J. Wineland,David R. Leibrandt,David R. Leibrandt,David Hume +28 more
TL;DR: An aluminum ion clock has a fractional-frequency uncertainty of less than one part in this article, a four-decades-long goal in precision, which is the state-of-the-art.
Journal ArticleDOI
Systematic uncertainty due to background-gas collisions in trapped-ion optical clocks
A. M. Hankin,A. M. Hankin,Ethan Clements,Ethan Clements,Yixiao Huang,Samuel M. Brewer,Samuel M. Brewer,Jwo-Sy Chen,Jwo-Sy Chen,Chin-Wen Chou,David Hume,David R. Leibrandt,David R. Leibrandt +12 more
TL;DR: In this article, the authors describe a framework for calculating the frequency shift and uncertainty of trapped-ion optical atomic clocks caused by background-gas collisions, and apply this framework to an optical atomic clock with 38(19) nPa of room-temperature background gas.
Journal ArticleDOI
Lifetime-Limited Interrogation of Two Independent Al + 27 Clocks Using Correlation Spectroscopy
Ethan Clements,Ethan Clements,May E. Kim,Kaifeng Cui,Kaifeng Cui,Aaron M. Hankin,Aaron M. Hankin,Samuel M. Brewer,Jose Valencia,Jose Valencia,Jwo-Sy Chen,Jwo-Sy Chen,Chin-Wen Chou,David R. Leibrandt,David R. Leibrandt,David Hume +15 more
TL;DR: By stabilizing the dominant sources of differential phase noise between the two clocks, coherence between them during synchronous Ramsey interrogations is observed and the observed contrast in the correlation spectroscopy signal is consistent with the 20.6 s ^{3}P-0 state lifetime.