Electro-Optical Ion Trap for Experiments with Atom-Ion Quantum Hybrid Systems

Perego, Elia; Duca, Lucia; Sias, Carlo

doi:10.3390/app10072222

Cited by 13 publications

(10 citation statements)

References 36 publications

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“…Very recently, we have observed collision energies at around the s-wave limit for the first time in this mixture [23]. We also note that a promising alternative solution is to use optical potentials for the trapped ion [24,25].…”

Section: Introductionmentioning

confidence: 59%

“…We have shown how laser spectroscopy on the ion can be used to determine its kinetic energy after interacting with the atoms. We have presented data showing that the temperature of the secular motion of the ion reaches 90 (35) µK in the radial and 108 (25) µK in the axial direction, respectively, after buffer gas cooling with the ultracold atoms. Measurements without the atom cloud show a background heating rate of 85(50) µK/s in the radial and 197(48) µK/s in the axial direction due to electric field noise.…”

Section: Discussionmentioning

confidence: 99%

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Experimental setup for studying an ultracold mixture of trapped Yb$^+$-$^6$Li

Hirzler,

Feldker,

Fürst

et al. 2020

Preprint

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We describe and characterize an experimental apparatus that has been used to study interactions between ultracold lithium atoms and ytterbium ions. The preparation of ultracold clouds of Li atoms is described as well as their subsequent transport and overlap with Yb + ions trapped in a Paul trap. We show how the kinetic energy of the ion after interacting with the atoms can be obtained by laser spectroscopy. From analyzing the dynamics of the ion in the absence of atoms, we conclude that background heating, due to electric field noise, limits attainable buffer gas cooling temperatures. We suspect that this effect can be mitigated by noise reduction and by increasing the density of the Li gas, in order to improve its cooling power. Imperfections in the Paul trap lead to so-called excess micromotion, which poses another limitation to the buffer gas cooling. We describe in detail how we measure and subsequently minimize excess micromotion in our setup. We measure the effect of excess micromotion on attainable ion temperatures after buffer gas cooling and compare this to molecular dynamics simulations which describe the observed data very well.

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Section: Introductionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Experimental setup for studying an ultracold mixture of trapped Yb$^+$-$^6$Li

Hirzler,

Feldker,

Fürst

et al. 2020

Preprint

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“…This hybrid optical-Paul trap would give an additional confinement for the ion which could benefit the attainable ion kinetic energies and suppress the impact of stray fields. Several approaches of using optical ion trapping in atom-ion setups have been experimentally explored [51][52][53], as an optical trap avoids the ion-heating effects present in time-dependent trapping potentials. However, the optical trap for an ion is typically less deep than an rf trap, meaning ions that gain energy due to inelastic collisions are more easily lost.…”

Section: Hybrid Optical-paul Trapmentioning

confidence: 99%

Buffer gas cooling of ions in time-dependent traps using ultracold atoms

Trimby,

Hirzler,

Fürst

et al. 2021

Preprint

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For exploration of quantum effects with hybrid atom-ion systems, reaching ultracold temperatures is the major limiting factor. In this work, we present results on numerical simulations of trapped ion buffer gas cooling using an ultracold atomic gas in a large number of experimentally realistic scenarios. We explore the suppression of micromotion-induced heating effects through optimization of trap parameters for various radio-frequency (rf) traps and rf driving schemes including linear and octupole traps, digital Paul traps, rotating traps and hybrid optical/rf traps. We find that very similar ion energies can be reached in all of them even when considering experimental imperfections that cause so-called excess micromotion. Moreover we look into a quantum description of the system and show that quantum mechanics cannot save the ion from micromotion-induced heating in an atom-ion collision. The results suggest that buffer gas cooling can be used to reach close to the ion's groundstate of motion and is even competitive when compared to some sub-Doppler cooling techniques such as Sisyphus cooling. Thus, buffer gas cooling is a viable alternative for ions that are not amenable to laser cooling, a result that may be of interest for studies into quantum chemistry and precision spectroscopy.

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“…Optical potentials are widely used for confining and controlling particles like atoms [1,2], molecules [3,4], and, more recently, ions [5,6]. Individual particles can be reliably isolated and arranged in optical potentials, resulting in ensembles that represent a hardware for quantum computation and quantum simulation.…”

Section: Introductionmentioning

confidence: 99%

Prospects for single photon sideband cooling of optically trapped neutral atoms

Berto,

Perego,

Duca

et al. 2021

Preprint

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We propose a novel cooling scheme for realising single photon sideband cooling on particles trapped in a state-dependent optical potential. We develop a master rate equation from an ab-initio model and find that in experimentally feasible conditions it is possible to drastically reduce the average occupation number of the vibrational levels by applying a frequency sweep on the cooling laser that sequentially cools all the motional states. Notably, this cooling scheme works also when a particle experiences a deeper trap in its internal ground state than in its excited state, a condition for which conventional single photon sideband cooling does not work. In our analysis, we consider two cases: a two-level particle confined in an optical tweezer and Li atoms confined in an optical lattice, and find conditions for efficient cooling in both cases. The results from the model are confirmed by a full quantum Monte Carlo simulation of the system Hamiltonian. Our findings provide an alternative cooling scheme that can be applied in principle to any particle, e.g. atoms, molecules or ions, confined in a state-dependent optical potential.

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Electro-Optical Ion Trap for Experiments with Atom-Ion Quantum Hybrid Systems

Cited by 13 publications

References 36 publications

Experimental setup for studying an ultracold mixture of trapped Yb$^+$-$^6$Li

Experimental setup for studying an ultracold mixture of trapped Yb$^+$-$^6$Li

Buffer gas cooling of ions in time-dependent traps using ultracold atoms

Prospects for single photon sideband cooling of optically trapped neutral atoms

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