A strontium lattice clock with 3 × 10<sup>−17</sup>inaccuracy and its frequency

Falke, Stephan; Lemke, Nathan D.; Grebing, Christian; Lipphardt, B.; Weyers, S.; Gerginov, Vladislav; Huntemann, N.; Hagemann, Christian; Al-Masoudi, A.; Häfner, Sebastian; Vogt, Stefan; Sterr, U.; Lisdat, Christian

doi:10.1088/1367-2630/16/7/073023

Cited by 189 publications

(202 citation statements)

References 68 publications

(156 reference statements)

Supporting

Mentioning

193

Contrasting

Unclassified

Order By: Relevance

“…One of the key factors for the measurement is the record stability between an optical and a microwave clock: 4.1 × 10 −14 / √ τ against Cs (and 2.8 × 10 −14 / √ τ against Rb). In 2014, PTB reported another absolute frequency measurement with an uncertainty of 3.9 × 10 −16 [25]. These two last measurements are in excellent agreement.…”

Section: Advanced Timekeepingmentioning

confidence: 58%

“…Proposed in 2001 [21][22], OLCs made tremendous progress in the last decade. OLCs have demonstrated unprecedented frequency stabilities of a few 10 −16 / √ τ and a record accuracy below 10 −17 [1], overcoming the best ion clocks [1,[23][24][25][26]. With current improvement in laser stabilization, OLCs are expected to reach a QPN limited stability on the order of 10 −17 / √ τ within a few years, thus enabling even better characterization of systematic effects.…”

Section: Optical Lattice Clocksmentioning

confidence: 99%

See 1 more Smart Citation

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Abgrall

Chupin

Sarlo

et al. 2015

Comptes Rendus. Physique

View full text Add to dashboard Cite

In this article, we report on the work done with the LNE-SYRTE atomic clock ensemble during the last 10 years. We cover progress made in atomic fountains and in their application to timekeeping. We also cover the development of optical lattice clocks based on strontium and on mercury. We report on tests of fundamental physical laws made with these highly accurate atomic clocks. We also report on work relevant to a future possible redefinition of the SI second. IntroductionResearch on highly accurate atomic frequency standards and their applications is making fast and steady progress. The quest for ever increased accuracy is advancing hand in hand with advances in quantum physics, with better understanding and manipulation of atomic systems, with exploration of fundamental laws of nature and with the development of important services and infrastructures for science and society. The quest for increased accuracy is also a powerful incentive to innovation in such areas as lasers, laser stabilization, low noise electronics, stable oscillators, low noise detection of optical signals, fiber devices and cold-atom based instrumentation for ground or space applications. Finally, in addition to enhancing existing applications, improved accuracy leads to new applications.This article focuses on key achievements and trends of the last 10 years. Over this period of time, the first generation of laser-cooled standards, using the atomic fountain geometry, reached maturity and had large impact on international timekeeping. The typical accuracy of these frequency standards, 2 parts in 10 16 , is now permanently accessible both locally and globally. At the same time, a new generation of optical clocks showed tremendous and steady improvement, gaining more than two orders of magnitude in a decade. To date, an accuracy of 6.4 × 10 −18 [1] was reported. Similarly, major improvements occurred in many other aspects of optical frequency metrology, notably in optical frequency combs and optical fiber links.In this article, we will report on developments of the LNE-SYRTE atomic clock ensemble since our 2004 report in the Special Issue of the Comptes Rendus de l'Académie des sciences on Fundamental Metrology [2]. This work exemplifies many of the above mentioned features of research on highly accurate atomic frequency standards. We will focus on frequency standards and their impact on timescales and timekeeping, on clock comparisons, including optical-to-microwave comparisons with combs, and their applications. Several

show abstract

Section: Advanced Timekeepingmentioning

confidence: 58%

Section: Optical Lattice Clocksmentioning

confidence: 99%

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Abgrall

Chupin

Sarlo

et al. 2015

Comptes Rendus. Physique

View full text Add to dashboard Cite

show abstract

“…At present, stability of opticallattice-based frequency standards is on the same level with single-ion standards and in some cases even better. The state-of-the-art prototypes reached instability and uncertainty on the relative levels of 10 −17 −10 −18 [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Ones of the main candidates for producing the newgeneration frequency standards are alkaline earth and alkaline-earth-like atoms: Yb (for instance, see [21][22][23]), Ca [24], Sr [18,19,25], Hg [26] and Mg [27,28]. These atoms are the most appropriate because of narrow spectroscopic lines due to forbidden optical transitions from the ground state 1 S 0 to the lowest excited triplet state 3 P 0,1,2 (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Quantum treatment of two-stage sub-Doppler laser cooling of magnesium atoms

et al. 2015

View full text Add to dashboard Cite

The problem of deep laser cooling of 24 Mg atoms is theoretically studied. We propose two-stage sub-Doppler cooling strategy using electro-dipole transition 3 3 P2→3 3 D3 (λ = 383.9 nm). The first stage implies exploiting magneto-optical trap with σ + and σ − light beams, while the second one uses a lin⊥lin molasses. We focus on achieving large number of ultracold atoms (T ef f <10 µK) in a cold atomic cloud. The calculations have been done out of many widely used approximations and based on quantum treatment with taking full account of recoil effect. Steady-state average kinetic energies and linear momentum distributions of cold atoms are analyzed for various light field intensities and frequency detunings. The results of conducted quantum analysis have revealed noticeable differences from results of semiclassical approach based on the Fokker-Planck equation. At certain conditions the second cooling stage can provide sufficiently lower kinetic energies of atomic cloud as well as increased fraction of ultracold atoms than the first one. We hope that the obtained results can assist overcoming current experimental problems in deep cooling of 24 Mg atoms by means of laser fields. Cold magnesium atoms, being cooled in large number down to several µK, have certain interest, for example, in quantum metrology.

show abstract

“…In this paper, we improve upon this best previous constraint on the LI violating parameter α by a factor of around two. Our test is based on four optical lattice clocks using Sr atoms, two located at LNE-SYRTE, Observatoire de Paris, France [18,19], one at PTB, Braunschweig, Germany [20,21], and one at NPL, Teddington, UK [22]. These clocks are connected by two fiber links, one running from SYRTE to PTB operated in June 2015 [9], and one from SYRTE to NPL operated in June 2016.…”

mentioning

confidence: 99%

Test of Special Relativity Using a Fiber Network of Optical Clocks

Delva¹,

Lodewyck²,

Bilicki³

et al. 2017

Phys. Rev. Lett.

194

127

View full text Add to dashboard Cite

Phase compensated optical fiber links enable high accuracy atomic clocks separated by thousands of kilometers to be compared with unprecedented statistical resolution. By searching for a daily variation of the frequency difference between four strontium optical lattice clocks in different locations throughout Europe connected by such links, we improve upon previous tests of time dilation predicted by special relativity. We obtain a constraint on the Robertson-Mansouri-Sexl parameter |α| 1.1 × 10 −8 quantifying a violation of time dilation, thus improving by a factor of around two the best known constraint obtained with Ives-Stilwell type experiments, and by two orders of magnitude the best constraint obtained by comparing atomic clocks. This work is the first of a new generation of tests of fundamental physics using optical clocks and fiber links. As clocks improve, and as fiber links are routinely operated, we expect that the tests initiated in this paper will improve by orders of magnitude in the near future.

show abstract

A strontium lattice clock with 3 × 10⁻¹⁷inaccuracy and its frequency

Cited by 189 publications

References 68 publications

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Quantum treatment of two-stage sub-Doppler laser cooling of magnesium atoms

Test of Special Relativity Using a Fiber Network of Optical Clocks

Contact Info

Product

Resources

About

A strontium lattice clock with 3 × 10−17inaccuracy and its frequency

Cited by 189 publications

References 68 publications

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Quantum treatment of two-stage sub-Doppler laser cooling of magnesium atoms

Test of Special Relativity Using a Fiber Network of Optical Clocks

Contact Info

Product

Resources

About

A strontium lattice clock with 3 × 10⁻¹⁷inaccuracy and its frequency