Direct Excitation of the Forbidden Clock Transition in Neutral<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Yb</mml:mi><mml:mprescripts /><mml:none /><mml:mn>174</mml:mn></mml:mmultiscripts></mml:math>Atoms Confined to an Optical Lattice

Barber, Zeb W.; Hoyt, Chad; Oates, C. W.; Hollberg, L.; Тайченачев, А. В.; Yudin, V. I.

doi:10.1103/physrevlett.96.083002

Cited by 245 publications

(202 citation statements)

References 19 publications

(27 reference statements)

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“…8). Research on optical lattice clocks (OLCs) is comparatively recent [9][10][11][12][13] , but in less than 10 years they have reached the 10 À 16 level [14][15][16] , with excellent prospects towards the 10 À 17 level. The large number of probed atoms, on the order of 10 4 , is a major asset: it already allows unprecedented statistical resolutions that translate into frequency stabilities of a few 10 À 16 at one second, demonstrated in some groups [17][18][19][20] .…”

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confidence: 99%

Experimental realization of an optical second with strontium lattice clocks

et al. 2013

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Progress in realizing the SI second had multiple technological impacts and enabled further constraint of theoretical models in fundamental physics. Caesium microwave fountains, realizing best the second according to its current definition with a relative uncertainty of 2-4 Â 10 À 16 , have already been overtaken by atomic clocks referenced to an optical transition, which are both more stable and more accurate. Here we present an important step in the direction of a possible new definition of the second. Our system of five clocks connects with an unprecedented consistency the optical and the microwave worlds. For the first time, two state-of-the-art strontium optical lattice clocks are proven to agree within their accuracy budget, with a total uncertainty of 1.5 Â 10 À 16 . Their comparison with three independent caesium fountains shows a degree of accuracy now only limited by the best realizations of the microwave-defined second, at the level of 3.1 Â 10 À 16 .

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confidence: 99%

Experimental realization of an optical second with strontium lattice clocks

et al. 2013

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“…Resolving nuclear sublevels with optical spectroscopy permits improved measurements of systematic errors associated with the nuclear spin, such as linear Zeeman shifts, and tensor polarizability that manifests itself as nuclear spin-dependent trap polarization sensitivity. Tensor polarizability of the 3 P 0 state is one of the important potential systematic uncertainties for fermion-based clocks, and is one of the primary motivations for recent proposals involving electromagnetically induced transparency resonances or DC magnetic field-induced state mixing in bosonic isotopes (26)(27)(28). The work reported here has permitted control of these systematic effects to ~5x10 -16 (29).…”

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confidence: 96%

Optical Atomic Coherence at the 1-Second Time Scale

Boyd

Zelevinsky

Ludlow

et al. 2006

Science

158

147

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Highest resolution laser spectroscopy has generally been limited to single trapped ion systems due to rapid decoherence which plagues neutral atom ensembles. Here, precision spectroscopy of ultracold neutral atoms confined in a trapping potential shows superior optical coherence without any deleterious effects from motional degrees of freedom, revealing optical resonance linewidths at the hertz level with an excellent signal to noise ratio. The resonance quality factor of 2.4 x 10 14 is the highest ever recovered in any form of coherent spectroscopy. The spectral resolution permits direct observation of the breaking of nuclear spin degeneracy for the 1 S 0 and 3 P 0 optical clock states of 87 Sr under a small magnetic bias field. This optical NMR-like approach allows an accurate measurement of the differential Landé g-factor between the two states. The optical atomic coherence demonstrated for collective excitation of a large number of atoms will have a strong impact on quantum measurement and precision frequency metrology.

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“…We use the technique of magnetic field-induced spectroscopy (MIS) to quench the forbidden transition [35], while the experimental setup we used to cool and probe the atoms has been described in [7].…”

Section: Probing Of the 88 Sr Clock Transitionmentioning

confidence: 99%

A high-stability semiconductor laser system for a 88Sr-based optical lattice clock

et al. 2010

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We describe a frequency-stabilized diode laser at 698 nm used for high-resolution spectroscopy of the 1 S 0 -3 P 0 strontium clock transition. For the laser stabilization we use state-of-the-art symmetrically suspended optical cavities optimized for very low thermal noise at room temperature. Two-stage frequency stabilization to high-finesse optical cavities results in measured laser frequency noise about a factor of three above the cavity thermal noise between 2 Hz and 11 Hz. With this system, we demonstrate high-resolution remote spectroscopy on the 88 Sr clock transition by transferring the laser output over a phase noisecompensated 200-m-long fiber link between two separated laboratories. Our dedicated fiber link ensures a transfer of the optical carrier with frequency stability of 7 × 10 −18 after 100 s integration time, which could enable the observation of the strontium clock transition with an atomic Q of 10 14 . Furthermore, with an eye toward the development of transportable optical clocks, we investigate how the complete laser system (laser + optics + cavity) can be influenced by environmental disturbances in terms of both short-and long-term frequency stability.

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Direct Excitation of the Forbidden Clock Transition in NeutralYb174Atoms Confined to an Optical Lattice

Cited by 245 publications

References 19 publications

Experimental realization of an optical second with strontium lattice clocks

Experimental realization of an optical second with strontium lattice clocks

Optical Atomic Coherence at the 1-Second Time Scale

A high-stability semiconductor laser system for a 88Sr-based optical lattice clock

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