Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network

Schioppo, M.; Kronjäger, Jochen; Silva, Alissa; Ilieva, Roumiana; Paterson, Jason; Baynham, Charles F. A.; Bowden, William; Hill, Ian R.; Hobson, Richard; Vianello, Alvise; Álvarez, M. Dovale; Williams, R. A.; Marra, Giuseppe; Margolis, H. S.; Amy‐Klein, Anne; Lopez, Olivier; Cantin, Etienne; Alvarez-Martinez, H.; Targat, Rodolphe Le; Pottie, Paul-Eric; Quintin, Nicolas; Legero, Thomas; Häfner, Sebastian; Sterr, U.; Schwarz, Roman; Dörscher, S.; Lisdat, Christian; Koke, Sebastian; Kühl, Alexander; Waterholter, Thomas; Benkler, E.; Grosche, G.

doi:10.1038/s41467-021-27884-3

Cited by 64 publications

(22 citation statements)

References 69 publications

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“…As all the measurements are made during the same observation window, the frequency ratios Yb + /Sr, Yb + /Cs and Sr/Cs can be calculated in post-processing and are independent of the maser frequency. The achieved stabilities in the Yb + /Sr, Yb + /Cs and Sr/Cs frequency ratios are all close to the quantum projection noise limits, determined by the number of atoms interrogated, the clock cycle times and the quality of the local master oscillator [45]. Fig.…”

Section: Methodssupporting

confidence: 69%

Analysis of atomic-clock data to constrain variations of fundamental constants

Sherrill¹,

Parsons²,

Baynham³

et al. 2023

Preprint

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We present a new framework to study the time variation of fundamental constants in a model-independent way. Model independence implies more free parameters than assumed in previous studies. Using data from atomic clocks based on 87 Sr, 171 Yb + and 133 Cs, we set bounds on parameters controlling the variation of the fine-structure constant, α, and the electron-to-proton mass ratio, µ. We consider variations on timescales ranging from a minute to almost a day. In addition, we use our results to derive some of the tightest limits to date on the parameter space of models of ultralight dark matter and axion-like particles.

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Section: Methodssupporting

confidence: 69%

Analysis of atomic-clock data to constrain variations of fundamental constants

Sherrill¹,

Parsons²,

Baynham³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Section: Methodsmentioning

confidence: 55%

Analysis of atomic-clock data to constrain variations of fundamental constants

Sherrill,

Parsons,

Baynham

et al. 2023

New J. Phys.

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We present a new framework to study the time variation of fundamental constants in a model-independent way. Model independence implies more free parameters than assumed in previous studies.Using data from atomic clocks based on $^{87}$Sr, $^{171}$Yb$^+$ and $^{133}$Cs, we set bounds on parameters controlling the variation of the fine-structure constant, $\alpha$, and the electron-to-proton mass ratio, $\mu$. We consider variations on timescales ranging from a minute to almost a day. In addition, we use our results to derive some of the tightest limits to date on the parameter space of models of ultralight dark matter and axion-like particles.

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“…In our laboratory, the optical comb enables the spectral transfer between the sub-harmonic wavelengths of our 171 Yb and 88 Sr lattice clocks [25,26] at 1156 nm and 1396 nm and a 1542 nm ultrastable radiation that is distributed between distant metrological institutes in Europe using optical fibers, to enable the comparison of remote optical clocks [27,28,29]. To this purpose, we exploit a broadband branch of the comb that covers the 1000-2000 nm region, obtained by amplification of the main comb output at 1550 nm in an Erbium-doped fiber amplifier followed by spectral broadening in a highly-nonlinear fiber.…”

Section: Methodsmentioning

confidence: 99%

Improving the resolution of comb-based frequency measurements using a track and hold amplifier

Risaro¹,

Savio²,

Pizzocaro³

et al. 2022

Preprint

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The advent of optical frequency standards with ultimate uncertainties in the low 1 × 10 −18 requires femtosecond frequency combs to support a similar level of resolution in the spectral transfer and the computation of optical frequency ratios. The related experimental challenges grow together with the number of optical frequencies to be measured simultaneously, as in many cases the comb's optical power does not allow reliable beatnote counting or tracking in all the spectral regions of interest. Here we describe the use of a track-and-hold amplifier to implement the gated detection, a previously proposed technique for improving the signal-to-noise ratio of the beatnote between a lowpower tooth of the frequency comb and a continuous wave laser. We demonstrate a 12 dB improvement in the signal-to-noise ratio of beatnotes involving a broadband-spanning optical comb as compared to traditional detection schemes. Our approach enables reliable and cycle-slip-free spectral purity transfer and reduces the system sensitivity to power drops in the comb spectrum. Being based on a single chip, it is robust, versatile and easily embedded in more complex experimental schemes.

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Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network

Cited by 64 publications

References 69 publications

Analysis of atomic-clock data to constrain variations of fundamental constants

Analysis of atomic-clock data to constrain variations of fundamental constants

Analysis of atomic-clock data to constrain variations of fundamental constants

Improving the resolution of comb-based frequency measurements using a track and hold amplifier

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