Modeling light shifts in optical lattice clocks

Nemitz, Nils; Jørgensen, Asbjørn A.; Yanagimoto, Ryotatsu; Bregolin, Filippo; Katori, Hidetoshi

doi:10.1103/physreva.99.033424

Cited by 28 publications

(33 citation statements)

References 30 publications

(68 reference statements)

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“…While a microscopic model offers the prospect of accuracy below the 10 −18 level, it requires significantly more input information, a potential source of systematic errors in reporting atomic coefficients. Recent work [46] has highlighted this importance by illustrating that different methods of preparing the atomic sample can result in different measurement values of β in Yb. For determining the operational light shift in the SrI clock the thermal model is employed.…”

Section: B Lattice Light Shift Evaluation -Model Uncertaintymentioning

confidence: 99%

JILA SrI optical lattice clock with uncertainty of $2.0 \times 10^{-18}$

et al. 2019

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We report on an improved systematic evaluation of the JILA SrI optical lattice clock, achieving a nearly identical systematic uncertainty compared to the previous strontium accuracy record set by the JILA SrII optical lattice clock (OLC) at 2.1 × 10 −18 . This improves upon the previous evaluation of the JILA SrI optical lattice clock in 2013, and we achieve a more than twenty-fold reduction in systematic uncertainty to 2.0 × 10 −18 . A seven-fold improvement in clock stability, reaching 4.8 × 10 −17 / √ τ for an averaging time τ in seconds, allows the clock to average to its systematic uncertainty in under 10 minutes. We improve the systematic uncertainty budget in several important ways. This includes a novel scheme for taming blackbody radiation-induced frequency shifts through active stabilization and characterization of the thermal environment, inclusion of higher-order terms in the lattice light shift, and updated atomic coefficients. Along with careful control of other systematic effects, we achieve low temporal drift of systematic offsets and high uptime of the clock. We additionally present an improved evaluation of the second order Zeeman coefficient that is applicable to all Sr optical lattice clocks. These improvements in performance have enabled several important studies including frequency ratio measurements through the Boulder Area Clock Optical Network (BACON), a high precision comparison with the JILA 3D lattice clock, a demonstration of a new all-optical time scale combining SrI and a cryogenic silicon cavity, and a high sensitivity search for ultralight scalar dark matter. * Equal Contributions

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Section: B Lattice Light Shift Evaluation -Model Uncertaintymentioning

confidence: 99%

JILA SrI optical lattice clock with uncertainty of $2.0 \times 10^{-18}$

et al. 2019

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“…3b). For optimal clock operation, we find an "operationally magic" condition that minimizes sensitivity to trap depth fluctuations [30][31][32] by performing two-lock comparisons for different wavelengths (Fig. 3b) (Appendix E).…”

Section: Self-comparison For Evaluation Of Systematic Shifts Frommentioning

confidence: 99%

“…Several previous studies have analyzed the polarizability and hyperpolarizability of alkaline-earth-like atoms, including 88 Sr, in magic wavelength optical lattices [30][31][32]53]. In their analyses, these studies include the effect of finite atom temperature by Taylor expanding the lattice potential in powers of √ I (I is the lattice intensity) in the vicinity of the magic wavelength [53].…”

Section: Appendix E: Tweezer-induced Light Shiftsmentioning

confidence: 99%

An Atomic-Array Optical Clock with Single-Atom Readout

et al. 2019

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Currently, the most accurate and stable clocks use optical interrogation of either a single ion or an ensemble of neutral atoms confined in an optical lattice. Here, we demonstrate a new optical clock system based on an array of individually trapped neutral atoms with single-atom readout, merging many of the benefits of ion and lattice clocks as well as creating a bridge to recently developed techniques in quantum simulation and computing with neutral atoms. We evaluate singlesite resolved frequency shifts and short-term stability via self-comparison. Atom-by-atom feedback control enables direct experimental estimation of laser noise contributions. Results agree well with an ab initio Monte Carlo simulation that incorporates finite temperature, projective read-out, laser noise, and feedback dynamics. Our approach, based on a tweezer array, also suppresses interaction shifts while retaining a short dead time, all in a comparatively simple experimental setup suited for transportable operation. These results establish the foundations for a third optical clock platform and provide a novel starting point for entanglement-enhanced metrology, quantum clock networks, and applications in quantum computing and communication with individual neutral atoms that require optical clock state control.

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“…3(b)]. For optimal clock operation, we find an "operationally magic" condition that minimizes sensitivity to trap-depth fluctuations [30][31][32] by performing two-lock comparisons for different wavelengths [ Fig. 3(b)] (Appendix E).…”

Section: Self-comparison For Evaluation Of Systematic Shifts Frommentioning

confidence: 99%

“…We further implement a standard interleaved selfcomparison technique [28,29] to evaluate systematic frequency shifts with changing external parametersspecifically, trap depth and wavelength-and find an operational magic condition [30][31][32] where the dependence on trap depth is minimized. We also demonstrate a proof of principle for extending such self-comparison techniques to evaluate single-site-resolved systematic frequency shifts as a function of a changing external parameter.…”

Section: Introductionmentioning

confidence: 99%

“Tweezer Clock” Offers New Possibilities in Timekeeping

Ludlow

2019

Physics

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Currently, the most accurate and stable clocks use optical interrogation of either a single ion or an ensemble of neutral atoms confined in an optical lattice. Here, we demonstrate a new optical clock system based on an array of individually trapped neutral atoms with single-atom readout, merging many of the benefits of ion and lattice clocks as well as creating a bridge to recently developed techniques in quantum simulation and computing with neutral atoms. We evaluate single-site-resolved frequency shifts and shortterm stability via self-comparison. Atom-by-atom feedback control enables direct experimental estimation of laser noise contributions. Results agree well with an ab initio Monte Carlo simulation that incorporates finite temperature, projective readout, laser noise, and feedback dynamics. Our approach, based on a tweezer array, also suppresses interaction shifts while retaining a short dead time, all in a comparatively simple experimental setup suited for transportable operation. These results establish the foundations for a third optical clock platform and provide a novel starting point for entanglement-enhanced metrology, quantum clock networks, and applications in quantum computing and communication with individual neutral atoms that require optical-clock-state control.

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Modeling light shifts in optical lattice clocks

Cited by 28 publications

References 30 publications

JILA SrI optical lattice clock with uncertainty of $2.0 \times 10^{-18}$

JILA SrI optical lattice clock with uncertainty of $2.0 \times 10^{-18}$

An Atomic-Array Optical Clock with Single-Atom Readout

“Tweezer Clock” Offers New Possibilities in Timekeeping

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