Optical coherence between atomic species at the second scale: improved\n clock comparisons via differential spectroscopy Article Swipe

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May E. Kim , William F. McGrew , Nicholas V. Nardelli , Ethan Clements , Youssef Hassan , Xiaogang Zhang , J. L. Valencia , Holly Leopardi , David Hume , Tara M. Fortier , A. D. Ludlow , David R. Leibrandt ·

YOU? · · 2021 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2109.09540

Comparisons of high-accuracy optical atomic clocks \\cite{Ludlow2015} are\nessential for precision tests of fundamental physics \\cite{Safronova2018},\nrelativistic geodesy \\cite{McGrew2018, Grotti2018, Delva2019}, and the\nanticipated redefinition of the SI second \\cite{Riehle2018}. The scientific\nreach of these applications is restricted by the statistical precision of\ninterspecies comparison measurements. The instability of individual clocks is\nlimited by the finite coherence time of the optical local oscillator (OLO),\nwhich bounds the maximum atomic interrogation time. In this letter, we\nexperimentally demonstrate differential spectroscopy \\cite{Hume2016}, a\ncomparison protocol that enables interrogating beyond the OLO coherence time.\nBy phase-coherently linking a zero-dead-time (ZDT) \\cite{Schioppo2017} Yb\noptical lattice clock with an Al$^+$ single-ion clock via an optical frequency\ncomb and performing synchronised Ramsey spectroscopy, we show an improvement in\ncomparison instability relative to our previous result\n\\cite{network2020frequency} of nearly an order of magnitude. To our knowledge,\nthis result represents the most stable interspecies clock comparison to date.\n

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Atomic clock Coherence (philosophical gambling strategy) Physics Spectroscopy Optical lattice Atomic physics Quantum mechanics Superfluidity

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2109.09540
PDF: https://arxiv.org/pdf/2109.09540
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Cited By: 1
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DOI: https://doi.org/10.48550/arxiv.2109.09540

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Title: Optical coherence between atomic species at the second scale: improved\n clock comparisons via differential spectroscopy

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Language: en

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Publication year: 2021

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Publication date: 2021-09-20

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Authors: May E. Kim, William F. McGrew, Nicholas V. Nardelli, Ethan Clements, Youssef Hassan, Xiaogang Zhang, J. L. Valencia, Holly Leopardi, David Hume, Tara M. Fortier, A. D. Ludlow, David R. Leibrandt

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Concepts: Atomic clock, Coherence (philosophical gambling strategy), Physics, Spectroscopy, Optical lattice, Atomic physics, Quantum mechanics, Superfluidity

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Cited by: 1

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