Frequency Metrology with Optical Lattice Clocks

Hong, Feng−Lei; Katori, Hidetoshi

doi:10.1143/jjap.49.080001

Cited by 5 publications

(5 citation statements)

References 100 publications

(213 reference statements)

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“…On the other hand, stateof-the-art experiments have achieved an uncertainty of 10 −18 with optical clocks [19][20][21][22]. Optical frequency combs are used to measure and compare optical and microwave clocks [23]. A frequency comb based on a Kerr-lens Ti:sapphire laser can cover more than one octave of optical frequencies from 500 to 1100 nm [3,4].…”

Section: Introductionmentioning

confidence: 99%

Optical frequency standards for time and length applications

Hong

2016

Meas. Sci. Technol.

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The last decade has witnessed tremendous progress in research on optical frequency metrology. Optical frequency standards using optical lattice and single-ion trap technologies have reached levels of stability and accuracy that surpass the performance of the best Cs fountain atomic clocks by orders of magnitude. Optical frequency standards are also used for various applications including length metrology. Optical frequency measurement and links using optical frequency combs and optical fibres play important roles in the development of optical frequency standards. This article introduces optical frequency standards recommended by the International Committee for Weights and Measures (CIPM) along with updates provided by recent research results. Frequency ratio measurements and remote frequency comparisons are addressed in relation to the work whose goal is to redefine the second. Optical frequency standard and optical frequency comb applications are also described.

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Section: Introductionmentioning

confidence: 99%

Optical frequency standards for time and length applications

Hong

2016

Meas. Sci. Technol.

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“…Following the development of frequency comb technology [73], as well as the long fiber links [74] that enabled transferring frequency stability with 10 −19 fractional uncertainty level [75] to over long distances for comparison with other references, optical lattice clocks were made available for the frequency metrology [76]. The tremendous improvement of optical lattice clocks reaching fractional uncertainty levels of 10 −18 makes them sensitive to a change in relativistic redshift effect in gravitational fields that corresponds to 1cm height difference, which shows great prospects for geodesy [77].…”

Section: Ael Atoms With Two-valance Electronsmentioning

confidence: 99%

Recent progresses of ultracold two-electron atoms

Hajiyev

Ren

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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In this topical review, we discuss the recent advances in ultracold two-electron atoms. Owing to their unique electronic level structure and relevant narrow optical transitions, alkaline-earth-like (AEL) atoms with two valence electrons expand our capabilities in exploring unprecedented physical settings, including an emergent SU(N) symmetry, orbital degrees of freedom with spin-exchange interactions, inter-orbital scattering resonances, and synthetic spin–orbit coupling. Here, we discuss in detail the recent experimental developments and the relevant theoretical works with AEL atoms. Finally, we conclude with a brief discussion of the future prospects for studies with AEL atoms.

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“…and time-dependent perturbation theory, one can derive the expressions of coefficients c (1) m j and c (2) and b (1) m j ,k j and b (2) m j ,k j . Besides the required transition matrix elements for the perturbative calculations, which have already been given in Ref.…”

Section: Expression Of Collisional Shiftmentioning

confidence: 99%

“…An optical lattice clock [1][2][3][4] with a large number of quantum absorbers separately trapped in the Lamb-Dicke regime and with a zero net ac Stark shift of the clock transition provides an opportunity to realize an exceptionally low instability of 10 −18 in one second. However, this vast potential has not yet been realized due to thermal-noise-limited laser sources [5][6][7][8], the Dick effect resulting from the unavoidable dead time during periodic interrogations [9,10], the collisional frequency shift caused by the excitation inhomogeneity [11][12][13], and the polarization-dependent and higher-order light shifts [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Collisional shifts in one- and two-dimensional shallow blue-detuned87Sr optical lattice clocks

2012

Phys. Rev. A

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We study the influence of ultracold collisions induced by the inhomogeneous excitation on the clock-transition frequency in one-and two-dimensional shallow blue-detuned (BD) 87 Sr optical lattice clocks with a magic wavelength of λ b = 389.889 nm. The minimal lattice potential required to tightly confine atoms in each single lattice site is much larger than that required for a red-detuned (RD) lattice operating at λ r = 813.4 nm because of the relatively smaller magic wavelength. For a deep optical lattice, the two-body interactions of atoms in a single lattice site mainly contribute to the clock-transition frequency shift, while the intersite collisions primarily affect the collisional shift in a shallow optical lattice. For an effective misalignment angle θ ∼ 10 mrad of the probe beam with respect to the lattice axis, the fractional collisional shifts in both one-and two-dimensional BD lattices are at the 10 −16 level.

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Frequency Metrology with Optical Lattice Clocks

Cited by 5 publications

References 100 publications

Optical frequency standards for time and length applications

Optical frequency standards for time and length applications

Recent progresses of ultracold two-electron atoms

Collisional shifts in one- and two-dimensional shallow blue-detuned87Sr optical lattice clocks

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