Optical Traps for Sympathetic Cooling of Ions with Ultracold Neutral Atoms

Schmidt, Jochen; Weckesser, Pascal; Thielemann, Fabian; Schaetz, Tobias; Karpa, Leon

doi:10.1103/physrevlett.124.053402

Cited by 57 publications

(59 citation statements)

References 47 publications

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“…These systems are of particular interest to study charged impurity physics in a quantum bath. The well-controlled ionic impurities may be used to probe properties of the atomic bath, or to study the decoherence of internal states and motion while interacting with a quantum environment [4,[9][10][11][12][13][14][15]. Notably, the charge-dipole interactions are longer ranged than those found in neutral systems [7,16].…”

Section: Introductionmentioning

confidence: 99%

Controlling the nature of a charged impurity in a bath of Feshbach dimers

Hirzler

Trimby

Lous

et al. 2020

Phys. Rev. Research

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We theoretically study the dynamics of a trapped ion that is immersed in an ultracold gas of weakly bound atomic dimers created by a Feshbach resonance. Using quasiclassical simulations, we find a crossover from dimer dissociation to molecular ion formation depending on the binding energy of the dimers. The location of the crossover strongly depends on the collision energy and the time-dependent fields of the Paul trap. Deeply bound dimers lead to fast molecular ion formation, with rates approaching the Langevin collision rate L ≈ 4.8 × 10 −9 cm 3 s −1. The kinetic energies of the created molecular ions have a median below 1 mK, such that they will stay confined in the ion trap. We conclude that interacting ions and Feshbach molecules may provide an alternative approach towards the creation of ultracold molecular ions with applications in precision spectroscopy and quantum chemistry.

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Section: Introductionmentioning

confidence: 99%

Controlling the nature of a charged impurity in a bath of Feshbach dimers

Hirzler

Trimby

Lous

et al. 2020

Phys. Rev. Research

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“…We next perform an experimental investigation of parametric driving as a tool for removing ions from a Paul trap. Our experimental setup [8,39,40] shown in Fig. 4 consists of a linear segmented Paul trap (with ion-electrode distance of 9 mm) under ultra-high vacuum (UHV).…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

“…octupolar) instability [28,29]. This method may be applicable to chemistry experiments which study reactions of ions and a (neutral) atomic ensemble [8,[30][31][32][33], but also to precision measurements where the spectroscopy ions are sympathetically cooled by an ion species amenable to laser cooling [34][35][36][37]. It could be extended to ions in Penning traps or storage rings.…”

Section: Introductionmentioning

confidence: 99%

Mass-selective removal of ions from Paul traps using parametric excitation

et al. 2020

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We study a method for mass-selective removal of ions from a Paul trap by parametric excitation. This can be achieved by applying an oscillating electric quadrupole field at twice the secular frequency $$\omega _{\text {sec}}$$ ω sec using pairs of opposing electrodes. While excitation near the resonance with the secular frequency $$\omega _{\text {sec}}$$ ω sec only leads to a linear increase of the amplitude with excitation duration, parametric excitation near $$2\, \omega _{\text {sec}}$$ 2 ω sec results in an exponential increase of the amplitude. This enables efficient removal of ions from the trap with modest excitation voltages and narrow bandwidth, therefore, substantially reducing the disturbance of ions with other charge-to-mass ratios. We numerically study and compare the mass selectivity of the two methods. In addition, we experimentally show that the barium isotopes with 136 and 137 nucleons can be removed from small ion crystals and ejected out of the trap while keeping $$^{138}\text {Ba}^{+}$$ 138 Ba + ions Doppler cooled, corresponding to a mass selectivity of better than $$\Delta m / m = 1/138$$ Δ m / m = 1 / 138 . This method can be widely applied to ion trapping experiments without major modifications since it only requires modulating the potential of the ion trap.

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“…The resulting parameters such as induced interactions can reach a fraction of the characteristic energy E , meaning that observation of interesting quantum phases will require cooling the system to nanokelvin temperatures. Recent experimental advancements [54][55][56] indicate that this can be achieved in the near future.…”

Section: Discussionmentioning

confidence: 99%

“…In the most standard state-of-the-art setting utilizing radio-frequency ion traps, a small atom-to-ion mass ratio (e.g., lithium atoms and ytterbium ions) enables one to reach the s-wave collision energy [54]. Successful sympathetic cooling of the ion has also been reported in optical traps [55]. Furthermore, it has been shown that sub-microkelvin temperatures can be attained when ionizing a Rydberg atom inside a Bose-Einstein condensate [56].…”

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confidence: 99%

Quantum simulation of extended polaron models using compound atom-ion systems

Jachymski

Negretti

2020

Phys. Rev. Research

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We consider the prospects for quantum simulation of condensed matter models exhibiting strong electronphonon coupling using a hybrid platform of trapped laser-cooled ions interacting with an ultracold atomic gas. This system naturally possesses a phonon structure, in contrast to the standard optical lattice scenarios usually employed with ultracold atoms in which the lattice is generated by laser light and thus it remains static. We derive the effective Hamiltonian describing the general system and discuss the arising energy scales, relating the results to commonly employed extended Hubbard-Holstein models. Although for a typical experimentally realistic system the coupling to phonons turns out to be small, we provide the means to enhance its role and reach interesting regimes with competing orders. Extended Lang-Firsov transformation reveals the emergence of phonon-induced long-range interactions between the atoms, which can give rise to both localized and extended bipolaron states with low effective mass, indicating the possibility of fermion pairing.

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Optical Traps for Sympathetic Cooling of Ions with Ultracold Neutral Atoms

Cited by 57 publications

References 47 publications

Controlling the nature of a charged impurity in a bath of Feshbach dimers

Controlling the nature of a charged impurity in a bath of Feshbach dimers

Mass-selective removal of ions from Paul traps using parametric excitation

Quantum simulation of extended polaron models using compound atom-ion systems

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