Strontium optical lattice clocks for practical realization of the metre and secondary representation of the second

Bober, Marcin; Morzynski, P.; Cygan, A.; Lisak, D.; Masłowski, Piotr; Prymaczek, M.; Wcisło, Piotr; Ablewski, P.; Piwiński, Mariusz; Wójtewicz, Szymon; Bielska, Katarzyna; Bartoszek-Bober, Dobrosława; Trawiński, R. S.; Zawada, M.; Ciuryło, R.; Zachorowski, Jerzy; Piotrowski, M.; Gawlik, Wojciech; Ozimek, F.; Radzewicz, Czesław

doi:10.1088/0957-0233/26/7/075201

Cited by 31 publications

(22 citation statements)

References 49 publications

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“…The first is the PDH-locked FS-CRDS used for probing the P7 P7 transition [11,20]. The second one is the optical atomic clock which provides the optical frequency reference [12,13]. The third one is the optical frequency comb, which transfers optical frequency between other subsystems [21].…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…The clock laser shifted by an AOM is digitally locked [27] to the 1 S 0 − 3 P 0 clock transition in ultracold 88 Sr atoms confined in a 1D optical lattice [12,13]. Long term frequency instability is below 10 −15 after 3 hours of averaging.…”

Section: B Absolute Frequency Determinationmentioning

confidence: 99%

“…The experimental spectra were collected here with an optical frequency comb (OFC) assisted, Pound-Drever-Hall locked frequency-stabilized cavity ring-down spectrometer (PDH-locked FS-CRDS) [11]. An 88 Sr optical atomic lattice clock [12,13] served as a frequency reference in most of the performed measurements. The spectrometer was optically linked to the optical atomic clock via the OFC [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Absolute frequency determination of molecular transition in the Doppler regime at kHz level of accuracy

Bielska

Wójtewicz

Morzynski

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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We measured absolute frequency of the unperturbed P7 P7 O2 B-band transition ν0 = 434783.5084857(82) GHz and the collisional self-shift coefficient δ = −9.381(62) × 10 −21 GHz/(molecule/cm 3 ). With Doppler-limited spectroscopy we achieved the relative standard uncertainty of 2 × 10 −11 on line position, typical for Doppler-free techniques. Shapes of the spectral line were measured with a Pound-Drever-Hall-locked frequency-stabilized cavity ring-down spectrometer referenced to an 88 Sr optical atomic clock via an optical frequency comb.

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Section: Experimental Apparatusmentioning

confidence: 99%

Section: B Absolute Frequency Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Absolute frequency determination of molecular transition in the Doppler regime at kHz level of accuracy

Bielska

Wójtewicz

Morzynski

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…On the other hand, the resonance spacings in collisions of Er and Li atoms in a magnetic field [30], and of highly magnetic europium ( 7 S) with alkali metal atoms [31] have both been shown to follow the non-chaotic poissonian distribution.Here we investigate the interactions and Feshbach spectra between weakly anisotropic lanthanides and heavy spin-singlet atoms using ErYb as a prime example. Ytterbium, alongside Sr, is the most widely used spin-singlet atom with applications for optical clocks, quantum gases and quantum simulation [32][33][34][35]. ErYb should also be very attractive due to the fantastic mass-scalability of both Yb [36,37] and Er (as shown here).…”

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confidence: 80%

Quantum chaos in Feshbach resonances of the ErYb system

2020

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We investigate ultracold magnetic-field-assisted collisions in the so far unexplored ErYb system. The nonsphericity of the Er atom leads to weakly anisotropic interactions that provide the mechanism for Feshbach resonances to emerge. The resonances are moderately sparsely distributed with a density of 0.1-0.3 G −1 and exhibit chaotic statistics characterized by a Brody parameter η≈0.5-0.7. The chaotic behaviour of Feshbach resonances is accompanied by strong mixing of magnetic and rotational quantum numbers in near-threshold bound states. We predict the existence of broad resonances at fields < 300 G that may be useful for the precise control of scattering properties and magnetoassociation of ErYb molecules. The high number of bosonic Er-Yb isotopic combinations gives many opportunities for mass scaling of interactions. Uniquely, two isotopic combinations have nearly identical reduced masses (differing by less than 10 −5 relative) that we expect to have strikingly similar Feshbach resonance spectra, which would make it possible to experimentally measure their sensitivity to hypothetical variations of proton-to-electron mass ratio. behaviour can be analyzed instead (see pioneering work of Porter and coworkers e.g. [24,25]) and the tools for such analysis include the Random Matrix Theory developed by Wigner [26] and Dyson [27]. For ultracold gases the first evidence of chaos in a Feshbach resonance spectrum was reported in Er dimer by Frisch et al [19]. Since then, the chaotic character of bound states and Feshbach resonances in ultracold collisions was also found for several other systems, for example, in mixtures of Yb atoms in 1 S 0 and 3 P 2 states at large magnetic fields [28], and molecular collisions of Li atom with CaH and CaF [29]. On the other hand, the resonance spacings in collisions of Er and Li atoms in a magnetic field [30], and of highly magnetic europium ( 7 S) with alkali metal atoms [31] have both been shown to follow the non-chaotic poissonian distribution.Here we investigate the interactions and Feshbach spectra between weakly anisotropic lanthanides and heavy spin-singlet atoms using ErYb as a prime example. Ytterbium, alongside Sr, is the most widely used spin-singlet atom with applications for optical clocks, quantum gases and quantum simulation [32][33][34][35]. ErYb should also be very attractive due to the fantastic mass-scalability of both Yb [36,37] and Er (as shown here). Three of the bosonic Yb isotopes, 168 Yb [38] and 170 Yb [39] and 174 Yb [40] form stable Bose-Einstein condensates, and several Fermi and Bose-Fermi and Bose-Bose gases [41, 42] have also been demonstrated experimentally. Er and Yb atoms could form many isotopic mixtures, including two fermion-fermion mixtures with nearly equal masses and very close polarizabilities (hence, trapping properties). While an Er-Yb quantum degenerate mixture has not been achieved yet, it is clearly within the reach of present state-of-the-art techniques. Our predictions could be tested by forming a dual Mott insulator of Er and Yb atoms...

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“…The experimental set-up of our system has been described in detail in ref. 16 , so only its most essential elements are presented below.…”

Section: Methodsmentioning

confidence: 99%

Absolute measurement of the 1S0 − 3P0 clock transition in neutral 88Sr over the 330 km-long stabilized fibre optic link

Morzynski

Bober

Bartoszek-Bober

et al. 2015

Sci Rep

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We report a stability below 7 × 10−17 of two independent optical lattice clocks operating with bosonic 88Sr isotope. The value (429 228 066 418 008.3(1.9)syst (0.9)stat Hz) of the absolute frequency of the 1S0 – 3P0 transition was measured with an optical frequency comb referenced to the local representation of the UTC by the 330 km-long stabilized fibre optical link. The result was verified by series of measurements on two independent optical lattice clocks and agrees with recommendation of Bureau International des Poids et Mesures.

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Strontium optical lattice clocks for practical realization of the metre and secondary representation of the second

Cited by 31 publications

References 49 publications

Absolute frequency determination of molecular transition in the Doppler regime at kHz level of accuracy

Absolute frequency determination of molecular transition in the Doppler regime at kHz level of accuracy

Quantum chaos in Feshbach resonances of the ErYb system

Absolute measurement of the 1S0 − 3P0 clock transition in neutral 88Sr over the 330 km-long stabilized fibre optic link

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