Direct Observation of Atom-Ion Nonequilibrium Sympathetic Cooling

Meir, Ziv; Pinkas, Meirav; Sikorsky, Tomas; Ben-shlomi, Ruti; Akerman, Nitzan; Ozeri, Roee

doi:10.1103/physrevlett.121.053402

Cited by 25 publications

(30 citation statements)

References 33 publications

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“…Co-trapping ultra-cold atoms and cold ions offers new possibilities for exploring low-temperature collisions, that include phenomena such as s-wave scattering, Feshbach resonances [1], shape-resonances [2] and the creation of molecular ions [3]. In addition, it is also a promising platform for performing quantum computations [4], quantum simulations [5] and for studying out-of-equilibrium dynamics [6]. In the last decade these hybrid systems were realized in several experiments, for reviews see [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

et al. 2020

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Experiments in which ultra-cold neutral atoms and charged ions are overlapped, constitute a new field in atomic and molecular physics, with applications ranging from studying out-of-equilibrium dynamics to simulating quantum many-body systems. The holy grail of ion-neutral systems is reaching the quantum low-energy scattering regime, known as the s-wave scattering. However, in most atom-ion systems, there is a fundamental limit that prohibits reaching this regime. This limit arises from the time-dependent trapping potential of the ion, the Paul trap, which sets a lower collision energy limit which is higher than the s-wave energy. In this work, we studied both theoretically and experimentally, the way the Paul trap parameters affect the energy distribution of an ion that is immersed in a bath of ultra-cold atoms. Heating rates and energy distributions of the ion are calculated for various trap parameters by a molecular dynamics (MD) simulation that takes into account the attractive atom-ion potential. The deviation of the energy distribution from a thermal one is discussed. Using the MD simulation, the heating dynamics for different atom-ion combinations is also investigated. In addition, we performed measurements of the heating rates of a ground-state cooled 88 Sr + ion that is immersed in an ultra-cold cloud of 87 Rb atoms, over a wide range of trap parameters, and compare our results to the MD simulation. Both the simulation and the experiment reveal no significant change in the heating for different parameters of the trap. However, in the experiment a slightly higher global heating is observed, relative to the simulation.

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Section: Introductionmentioning

confidence: 99%

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

et al. 2020

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“…Dynamic control over the Rydberg-dressed atom-ion system would allow for the creation of atom-ion spin-spin interactions [10] and tailoring of repulsive atom-ion interactions. The latter suppresses micromotion-induced heating [11] which has formed the major limitation in creating ultracold atom-ion mixtures [18,19].…”

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Observation of Interactions between Trapped Ions and Ultracold Rydberg Atoms

et al. 2019

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We report on the observation of interactions between ultracold Rydberg atoms and ions in a Paul trap. The rate of observed inelastic collisions, which manifest themselves as charge transfer between the Rydberg atoms and ions, exceeds that of Langevin collisions for ground state atoms by about three orders of magnitude. This indicates a huge increase in interaction strength. We study the effect of the vacant Paul trap's electric fields on the Rydberg excitation spectra. To quantitatively describe the exhibited shape of the ion loss spectra, we need to include the ion-induced Stark shift on the Rydberg atoms. Furthermore, we demonstrate Rydberg excitation on a dipole-forbidden transition with the aid of the electric field of a single trapped ion. Our results confirm that interactions between ultracold atoms and trapped ions can be controlled by laser coupling to Rydberg states. Adding dynamic Rydberg dressing may allow for the creation of spin-spin interactions between atoms and ions, and the elimination of collisional heating due to ionic micromotion in atom-ion mixtures. arXiv:1809.03987v3 [physics.atom-ph]

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“…Interesting extensions of the theory could include more general electronic level structures [14,45], and applying the action-angle framework to setups where power-law distributions in energy (in an averaged sense) were predicted for collisions of ions with neutral atoms [46][47][48][49]. The interplay of micromotion, noise and laser cooling is of significant importance for applications in quantum information processing and the operation of quantum gates and entanglement operations with trapped ions [19,22,26,[50][51][52][53][54][55][56][57][58][59][60][61][62][63][64].…”

Section: Discussionmentioning

confidence: 99%

Tuning nonthermal distributions to thermal ones in time-dependent Paul traps

Landa

2019

Phys. Rev. A

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We study the probability distribution of an atomic ion being laser-cooled in a periodically-driven Paul trap using a Floquet approach to the semiclassical photon scattering dynamics. We show that despite the microscopic nonequilibrium forces, a stationary thermal-like exponential distribution can be obtained in the Hamiltonian action, or equivalently in the number of quanta (phonons) of the motion linearized about the zero of the potential. At the presence of additional stray electric fields, the ion is pushed from the origin of the potential and set into a large-amplitude driven oscillation, and above a threshold amplitude of such "excess micromotion", the action distribution of excitations about the driven oscillation broadens and becomes distinctly nonthermal. We find that by a proper choice of the laser detuning the distribution can be made exponential again, with a mean phonon number close to that of the Doppler cooling limit. We derive a relation allowing to deduce just from the experimentally observable photon scattering rate both the required detuning for optimal cooling and the final mean phonon number. These results are important for quantum information processing and other applications, and in particular the derived approach can be applied to crystals of trapped ions in planar configurations, where the driven motion of ions is unavoidable.

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Direct Observation of Atom-Ion Nonequilibrium Sympathetic Cooling

Cited by 25 publications

References 33 publications

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

Observation of Interactions between Trapped Ions and Ultracold Rydberg Atoms

Tuning nonthermal distributions to thermal ones in time-dependent Paul traps

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