Prospects for single-photon sideband cooling of optically trapped neutral atoms

Berto, Federico; Perego, Elia; Duca, Lucia; Sias, Carlo

doi:10.1103/physrevresearch.3.043106

Cited by 3 publications

(3 citation statements)

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“…Nevertheless, the apparatus can be easily adapted to other atom-ion mixtures with minor changes of the optical setup. The position and shape of the Paul trap's endcaps ensure a wide optical access to the ion trapping region, facilitating the optical transport of ultracold atoms, which will be produced in an optical trap in a separate vacuum chamber [36]. The production of quantum gases and trapped ions will be synchronized by managing the overall experimental sequence with a single control apparatus [37].…”

Section: Discussionmentioning

confidence: 99%

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

2020

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In the development of atomic, molecular and optical (AMO) physics, atom-ion hybrid systems are characterized by the presence of a new tool in the experimental AMO toolbox: atom-ion interactions. One of the main limitations in state-of-the-art atom-ion experiments is represented by the micromotion component of the ions' dynamics in a Paul trap, as the presence of micromotion in atom-ion collisions results in a heating mechanism that prevents atom-ion mixtures from undergoing a coherent evolution.Here we report the design and the simulation of a novel ion trapping setup especially conceived for the integration with an ultracold atoms experiment. The ion confinement is realized by using an electro-optical trap based on the combination of an optical and an electrostatic field, so that no micromotion component will be present in the ions' dynamics. The confining optical field is generated by a deep optical lattice created at the crossing of a bow-tie cavity, while a static electric quadrupole ensures the ions' confinement in the plane orthogonal to the optical lattice. The setup is also equipped with a Paul trap for cooling the ions produced by photoionization of a hot atomic beam, and the design of the two ion traps facilitates the swapping of the ions from the Paul trap to the electro-optical trap.

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Section: Discussionmentioning

confidence: 99%

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

2020

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“…Such a frequency chirp then dissipates motional quanta without concurrent heating, since the protocol assures that higher vibrational states are first transferred to lower energy, before states closer to the trap bottom are addressed (see also Ref. [28] for a recent proposal).…”

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confidence: 99%

“…For example, the tweezer wavelength selected in this work provides magic trapping of the two clock states 3 P 0 and 3 P 2 , which enables new concepts for qubit encoding in a neutral atom quantum computer [18]. The cooling scheme also allows operating at wavelengths that offer additional magic trapping for Rydberg states, which mitigates decoherence and in-fidelity of two-body gates [17], and is also applicable to optical lattice systems [28]. Finally, we expect that applying individually controlled cooling beams along radial and axial direction in a pulsed sequence should allow for reaching the full threedimensional trap ground-state, and leave a detailed investigation of the cooling dynamics along the weakly trapped tweezer axis for future work.…”

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Motional ground-state cooling of single atoms in state-dependent optical tweezers

Hölzl¹,

Aaron²,

Wirth³

et al. 2023

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Laser cooling of single atoms in optical tweezers is a prerequisite for neutral atom quantum computing and simulation. Resolved sideband cooling comprises a well-established method for efficient motional ground-state preparation, but typically requires careful cancellation of light shifts in so-called magic traps.Here, we study a novel laser cooling scheme which overcomes such constraints, and applies when the ground-state of a narrow cooling transition is trapped stronger than the excited state. We demonstrate our scheme, which exploits sequential addressing of red sideband transitions via frequency chirping of the cooling light, at the example of 88 Sr atoms, and report ground-state populations compatible with recent experiments in magic tweezers. The scheme also induces light-assisted collisions, which are key to the assembly of large atom arrays. Our work enriches the toolbox for tweezer-based quantum technology, also enabling applications for tweezer-trapped molecules and ions that are incompatible with resolved sideband cooling conditions.

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