Budget of Uncertainties in the Cesium Frequency Frame of Fountain Type

Blinov, I. Yu.; Бойко, А. І.; Domnin, Yu. S.; Kostromin, V. P.; Kupalova, O.; Kupalov, D. S.

doi:10.1007/s11018-017-1145-z

Cited by 19 publications

(7 citation statements)

References 3 publications

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“…The BIPM calculates it from the contribution of primary and secondary frequency standards up to one year before the reporting period. The primary frequency standards reporting data during this campaign were the Cs Fountains PTB-CSF1, PTB-CSF2 [66], SYRTE-FO1, SYRTE-FO2, SYRTE-FOM [67], SU-CsFO2 [68], NIM5 [69] and the Cs thermal beams PTB-CS1 and PTB-CS2 [70]. The Cs Fountain ITCsF2 [28] did not contributed during the campaign but submitted data within the previous year.…”

Section: Uncertainty Ofmentioning

confidence: 99%

Absolute frequency measurement of the ¹S₀–³P₀ transition of ¹⁷¹Yb with a link to international atomic time

et al. 2020

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We report the absolute frequency measurement of the unperturbed optical clock transition 1S0–3P0 in 171Yb performed with an optical lattice frequency standard. Traceability to the International System of Units is provided by a link to International Atomic Time. The measurement result is 518 295 836 590 863.61(13) Hz with a relative standard uncertainty of , obtained operating our 171Yb optical frequency standard intermittently for 5 months. The 171Yb optical frequency standard contributes with a systematic uncertainty of .

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Section: Uncertainty Ofmentioning

confidence: 99%

Absolute frequency measurement of the ¹S₀–³P₀ transition of ¹⁷¹Yb with a link to international atomic time

et al. 2020

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“…The satellite link uncertainty in y(UTC(NMIJ) − TAI) was calculated to be 2.3 × 10 −15 for T link = 25 days, 2.0 × 10 −16 for T link = 30 days, and 1.7 × 10 −16 for T link = 35 days using the recommended formula ( √ 2u A )/[(3600 × 24 × 5)( T link 5 ) 0.9 ] [16] with the statistical uncertainty u A = 0.3 ns reported in Circular T. The statistical and systematic uncertainties of y(TAI − SI) were calculated from the total uncertainty of y(TAI − SI) and the systematic uncertainties of the primary and secondary frequency standards reported in Circular T. During the present half-year period, the frequency of TAI was calibrated by using the following frequency standards: Cs thermal beam clocks (PTB-Cs1 and PTB-Cs2 [59]), Cs fountain clocks (SYRTE-FO1, SYRTE-FO2, SYRTE-FOM [60], PTB-CSF1, PTB-CSF2 [61], SU-CsFO2 [62], and NIM5 [63]), a Rb fountain clock (SYRTE-FORb [64]), and a Sr optical lattice clock (NICT-Sr1 [29]). Since Circular T only provides the total uncertainty of y(TAI−SI), the systematic uncertainty of y(TAI − SI) was estimated using the systematic uncertainties and weights of the individual frequency standards based on a method described in Ref.…”

Section: Absolute Frequency Measurementmentioning

confidence: 99%

Demonstration of the nearly continuous operation of an¹⁷¹Yb optical lattice clock for half a year

et al. 2020

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Optical lattice clocks surpass primary Cs microwave clocks in frequency stability and accuracy, and are promising candidates for a redefinition of the second in the International System of Units (SI). However, the robustness of optical lattice clocks has not yet reached a level comparable to that of Cs fountain clocks which contribute to International Atomic Time (TAI) by the nearly continuous operation. In this paper, we report the long-term operation of an 171 Yb optical lattice clock with a coverage of 80.3% for half a year including uptimes of 93.9% for the first 24 days and 92.6% for the last 35 days. This enables a nearly dead-time-free frequency comparison of the optical lattice clock with TAI over months, which provides a link to the SI second with an uncertainty of low 10 −16. By using this link, the absolute frequency of the 1 S 0 − 3 P 0 clock transition of 171 Yb is measured as 518 295 836 590 863.54(26) Hz with a fractional uncertainty of 5.0×10 −16. This value is in agreement with the recommended frequency of 171 Yb as a secondary representation of the second.

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“…Among them, the largest contributions to the total uncertainty are collisional shift and microwave-power related frequency shift. CsF2 [20] CsF2 [95] FO2 [96] CsF2 [97] CsFO2 [21] F2 [98] NIM5 [99] CsF1 [100] FOC2 [97]…”

Section: Fountain Clock Evaluationsmentioning

confidence: 99%

“…Time and frequency also play a vital role in the navigation systems, network synchronization in the telecommunication field, etc. Today, the cesium (Cs) and rubidium (Rb) atomic fountain clocks have achieved an accuracy of a few parts in 10 16 , [17][18][19][20][21][22][23][24][25] while the type B uncertainty of the best optical clock based on single Al + ion has been lowered down to the 10 −19 region. [26] In parallel, the state of art manufacturing technologies with the development of smaller and robust while much cheaper electronic components, have extended the applications of frequency standards to much wider areas.…”

Section: Introductionmentioning

confidence: 99%

Cold atom clocks and their applications in precision measurements*

Dai¹,

Zheng²,

Liu³

et al. 2021

Chinese Phys. B

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Cold atom clocks have made remarkable progresses in the last two decades and played critical roles in precision measurements. Primary Cs fountain frequency standards have achieved a total uncertainty of a few parts in 1016, and the best optical clock has reached a type B uncertainty below 10−18. Besides applications in the metrology, navigation, etc., ultra-stable and ultra-accurate atomic clocks have also become powerful tools in the basic scientific investigations. In this paper, we focus on the recent developments in the high-performance cold atomic clocks which can be used as frequency standards to calibrate atomic time scales. The basic principles, performances, and limitations of fountain clocks and optical clocks based on signal trapped ion or neutral atoms are summarized. Their applications in metrology and other areas are briefly introduced.

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Budget of Uncertainties in the Cesium Frequency Frame of Fountain Type

Cited by 19 publications

References 3 publications

Absolute frequency measurement of the ¹S₀–³P₀ transition of ¹⁷¹Yb with a link to international atomic time

Absolute frequency measurement of the ¹S₀–³P₀ transition of ¹⁷¹Yb with a link to international atomic time

Demonstration of the nearly continuous operation of an¹⁷¹Yb optical lattice clock for half a year

Cold atom clocks and their applications in precision measurements*

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Budget of Uncertainties in the Cesium Frequency Frame of Fountain Type

Cited by 19 publications

References 3 publications

Absolute frequency measurement of the 1S0–3P0 transition of 171Yb with a link to international atomic time

Absolute frequency measurement of the 1S0–3P0 transition of 171Yb with a link to international atomic time

Demonstration of the nearly continuous operation of an171Yb optical lattice clock for half a year

Cold atom clocks and their applications in precision measurements*

Contact Info

Product

Resources

About

Absolute frequency measurement of the ¹S₀–³P₀ transition of ¹⁷¹Yb with a link to international atomic time

Absolute frequency measurement of the ¹S₀–³P₀ transition of ¹⁷¹Yb with a link to international atomic time

Demonstration of the nearly continuous operation of an¹⁷¹Yb optical lattice clock for half a year