Preparation of a Heteronuclear Two-atom System in the 3D Motional Ground State in an Optical Tweezer

Abstract

We report the realization of a heteronuclear two-atom of ${}^{87}$Rb-${}^{85}$Rb in the ground state of an optical tweezer (OT). Starting by trapping two different isotopic single atoms, a ${}^{87}$Rb and a ${}^{85}$Rb in two strongly focused and linearly polarized OT with 4 $\mu$m apart, we perform simultaneously three dimensional Raman sideband cooling for both atoms and the obtained 3D ground state probabilities of ${}^{87}$Rb and ${}^{85}$Rb are 0.91(5) and 0.91(10) respectively. There is no obvious crosstalk observed during the cooling process. We then merge them into one tweezer via a species-dependent transport, where the species-dependent potentials are made by changing the polarization of the OTs for each species from linear polarization to the desired circular polarization. The measurable increment of vibrational quantum due to merging is $0.013(1)$ for the axial dimension. This two-atom system can be used to investigate cold collisional physics, to form quantum logic gates, and to build a single heteronuclear molecule. It can also be scaled up to few-atom regime and extended to other atomic species and molecules, and thus to ultracold chemistry.

arXiv comment10 pages, 11 figures

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• Preparation of one ${}^{87}$Rb and one ${}^{133}$Cs atom in a single optical tweezer
• Speed, retention loss, and motional heating of atoms in an optical conveyor belt
• Coherent optical creation of a single molecule
• Enhancing dipolar interactions between molecules using state-dependent optical tweezer traps
• Discrete-Time Quantum-Walk & Floquet Topological Insulators via Distance-Selective Rydberg-Interaction
• Preparation of ${}^{87}$Rb and ${}^{133}$Cs in the motional ground state of a single optical tweezer
• Imaging a ${}^6$Li Atom In An Optical Tweezer 2000 Times with $\Lambda$-Enhanced Gray Molasses
• Quantum simulation of the central spin model with a Rydberg atom and polar molecules in optical tweezers
• Observation of confinement-induced resonances in a 3D lattice
• Individual assembly of two-species Rydberg molecules using optical tweezers
• A fiber array architecture for atom quantum computing
• Analytical solution for the spectrum of two ultracold atoms in a completely anisotropic confinement
• Mitigating noise of residual electric fields for single Rydberg atoms with electron photodesorption
• Probing the interaction energy of two ${}^{85}$Rb atoms in an optical tweezer via spin-motion coupling
• Revealing Energy Dependence of Quantum Defects via Two Heteronuclear Atoms in an Optical Tweezer