Efficient production of long-lived ultracold 
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 molecules

Ciamei, Alessio; Bayerle, Alex; Chen, Chun-Chia; Pasquiou, Benjamin; Schreck, Florian

doi:10.1103/physreva.96.013406

Cited by 42 publications

(54 citation statements)

References 48 publications

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“…The second error contribution is the light shift on the two-colour transition arising from the spectroscopy lasers themselves. We have characterized it for some of the points and estimated it for the others as explained in our previous work [47]. This amounts to shifts up to 100 kHz for the typical laser powers used here.…”

Section: Resultsmentioning

confidence: 89%

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The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

Ciamei

Szczepkowski

Bayerle

et al. 2018

Phys. Chem. Chem. Phys.

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We report on spectroscopic studies of hot and ultracold RbSr molecules, and combine the results in an analysis that allows us to fit a potential energy curve (PEC) for the X(1) 2 Σ + ground state bridging the short-to-long-range domains. The ultracold RbSr molecules are created in a µK sample of Rb and Sr atoms and probed by two-colour photoassociation spectroscopy. The data yield the long-range dispersion coefficients C6 and C8, along with the total number of supported bound levels. The hot RbSr molecules are created in a 1000 K gas mixture of Rb and Sr in a heat-pipe oven and probed by thermoluminescence and laser-induced fluorescence spectroscopy. We compare the hot molecule data with spectra we simulated using previously published PECs determined by three different ab-initio theoretical methods. We identify several band heads corresponding to radiative decay from the B(2) 2 Σ + state to the deepest bound levels of X(1) 2 Σ + . We determine a mass-scaled high-precision model for X(1) 2 Σ + by fitting all data using a single fit procedure. The corresponding PEC is consistent with all data, thus spanning short-to-long internuclear distances and bridging an energy gap of about 75% of the potential well depth, still uncharted by any experiment. We benchmark previous ab-initio PECs against our results, and give the PEC fit parameters for both X(1) 2 Σ + and B(2) 2 Σ + states. As first outcomes of our analysis, we calculate the s-wave scattering properties for all stable isotopic combinations and corroborate the locations of Fano-Feshbach resonances between alkali Rb and closed-shell Sr atoms recently observed [Barbé et al., Nat. ]. These results and more generally our strategy should greatly contribute to the generation of ultracold alkali -alkaline-earth dimers, whose applications range from quantum simulation to state-controlled quantum chemistry.

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Section: Resultsmentioning

confidence: 89%

“…Given the trap used here, only the differential polarizability between atoms and molecules affecting the centre-ofmass Hamiltonian is relevant. For Sr 2 we have shown that the relative variation of the polarizability is smaller than 1 % [47]. Here we use the conservative value of 5 % to estimate the errors if not characterized.…”

Section: Resultsmentioning

confidence: 99%

The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

Ciamei

Szczepkowski

Bayerle

et al. 2018

Phys. Chem. Chem. Phys.

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“…The improved understanding of the electronically excited state will be pivotal in the creation of ground-state CsYb molecules. The measurements presented here are the starting point for two-photon photoassociation to near-threshold levels of the X 2 Σ + 1/2 ground-state potential and for all-optical approaches such as STIRAP to produce molecules in the absolute ground state [49,50]. Two-photon PA will also allow precise determination of the interspecies scattering lengths and the prediction of Feshbach resonances suitable for magnetoassociation.…”

Section: Discussionmentioning

confidence: 95%

“…By choosing an excited vibrational level with a favourable Franck-Condon overlap with the ground state, photoassociation can be used as a method of producing groundstate ultracold molecules [44][45][46][47][48]. Alternatively, the coherent transfer of a colliding atom pair to a bound vibrational level of the molecular ground state is also possible, as has been investigated in Sr 2 [49,50]. The two techniques can be combined using photoassociation to populate a high-lying vibrational level followed by coher-FIG.…”

Section: Introductionmentioning

confidence: 99%

Production of ultracold Cs*Yb molecules by photoassociation

et al. 2018

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“…= 2.25µs, t 1 = 2.2491µs. The intermediate-level detuning is ∆ = 2π × 353MHz accessible by most current experiments, e.g [38]…”

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confidence: 99%

Robust switching of superposition-states via a coherent double stimulated Raman adiabatic passage

Yan

et al. 2018

J. Opt. Soc. Am. B

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Coherent manipulation of quantum states is of crucial importance in accurate control of a quantum system. A fundamental goal is coherently transferring the population of a desired state with near-unit fidelity. For this propose, we theoretically demonstrate a novel coherent double-stimulated Raman adiabatic passage (STIRAP) in a three-level Λ-type system for realizing the switch of unequal initial preparations on two ground states. This operation uses single optical pulse sequence accomplishing both bright-STIRAP and dark-STIRAP process, in which the intermediate-level detuning and the pulse delay must be given an optimal adjustment. Besides, owing to the imperfection of double-STIRAP transition, the sensitivity of the switch fidelity with respect to the spontaneous loss from the intermediate state, to the pulse amplitude and to the population difference, are also discussed. This work suggests a simple and experimentally-feasible all-optical approach to switch the superposition quantum state, serving as one-step closer to the goal of coherent manipulation of quantum systems.

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Efficient production of long-lived ultracold Sr2 molecules

Cited by 42 publications

References 48 publications

The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

Production of ultracold Cs*Yb molecules by photoassociation

Robust switching of superposition-states via a coherent double stimulated Raman adiabatic passage

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Efficient production of long-lived ultracold Sr2 molecules

Cited by 42 publications

References 48 publications

The RbSr2Σ+ground state investigatedviaspectroscopy of hot and ultracold molecules

The RbSr2Σ+ground state investigatedviaspectroscopy of hot and ultracold molecules

Production of ultracold Cs*Yb molecules by photoassociation

Robust switching of superposition-states via a coherent double stimulated Raman adiabatic passage

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The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules