Preparation of one ${}^{87}$Rb and one ${}^{133}$Cs atom in a single optical tweezer

Abstract

We report the preparation of exactly one ${}^{87}$Rb atom and one ${}^{133}$Cs atom in the same optical tweezer as the essential first step towards the construction of a tweezer array of individually trapped ${}^{87}$Rb${}^{133}$Cs molecules. Through careful selection of the tweezer wavelengths, we show how to engineer species-selective trapping potentials suitable for high-fidelity preparation of Rb $+$ Cs atom pairs. Using a wavelength of 814~nm to trap Rb and 938~nm to trap Cs, we achieve loading probabilities of $0.508(6)$ for Rb and $0.547(6)$ for Cs using standard red-detuned molasses cooling. Loading the traps sequentially yields exactly one Rb and one Cs atom in $28.4(6)\%$ of experimental runs. Using a combination of an acousto-optic deflector and a piezo-controlled mirror to control the relative position of the tweezers, we merge the two tweezers, retaining the atom pair with a probability of $0.99_{(-0.02)}^{(+0.01)}$. We use this capability to study hyperfine-state-dependent collisions of Rb and Cs in the combined tweezer and compare the measured two-body loss rates with coupled-channel quantum scattering calculations.

arXiv comment22 pages, 6 figures

References in corpus (75)

• A High Phase-Space-Density Gas of Polar Molecules
• Quantum computation with trapped polar molecules
• Cold and Ultracold Molecules: Science, Technology, and Applications
• Many-Body Physics with Individually-Controlled Rydberg Atoms
• A toolbox for lattice spin models with polar molecules
• Realizing a lattice spin model with polar molecules
• An atom-by-atom assembler of defect-free arbitrary 2d atomic arrays
• Quantum computing with atomic qubits and Rydberg interactions: Progress and challenges
• Parallel implementation of high-fidelity multi-qubit gates with neutral atoms
• Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
• Ultracold Dipolar Gas of Fermionic ${}^{23}$Na${}^{40}$K Molecules in their Absolute Ground State
• Magneto-optical trapping of a diatomic molecule
• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Controlling the quantum stereodynamics of ultracold bimolecular reactions
• Molecules cooled below the Doppler limit
• Creation of an ultracold gas of ground-state ${}^{23}{\mathrm{Na}}^{87}\mathrm{Rb}$ molecules
• Schemes for robust quantum computation with polar molecules
• An Optical Tweezer Array of Ultracold Molecules
• A neutral atom quantum register
• Cooling a single atom in an optical tweezer to its quantum ground state
• Randomized benchmarking of single qubit gates in a 2D array of neutral atom qubits
• Coherence and Raman sideband cooling of a single atom in an optical tweezer
• Building one molecule from a reservoir of two atoms
• Laser Cooling of Optically Trapped Molecules
• Alkaline earth atoms in optical tweezers
• 3-D Magneto-Optical Trap of Yttrium Monoxide
• Microscopic control and detection of ultracold strontium in optical-tweezer arrays
• Quantum magnetism with multicomponent polar molecules in an optical lattice
• Long-Lived Ultracold Molecules with Electric and Magnetic Dipole Moments
• Direct observation of bimolecular reactions of ultracold KRb molecules
• Dipolar Exchange Quantum Logic Gate with Polar Molecules
• Quantum Magnetism with Polar Alkali Dimers
• Energy distribution and cooling of a single atom in an optical tweezer
• Defect-free assembly of 2D clusters of more than 100 single-atom quantum systems
• Narrow-line cooling and imaging of Ytterbium atoms in an optical tweezer array
• Observation of magnetically tunable Feshbach resonances in ultracold ${}^{23}$Na${}^{40}$K+${}^{40}$K collisions
• Ultracold polar molecules as qudits
• Towards the production of ultracold ground-state RbCs molecules: Feshbach resonances, weakly bound states, and coupled-channel model
• MOLSCAT: a program for non-reactive quantum scattering calculations on atomic and molecular collisions
• Ultracold molecules for quantum simulation: rotational coherences in CaF and RbCs
• Statistical Aspects of Ultracold Resonant Scattering
• Assembly of a rovibrational ground state molecule in an optical tweezer
• Photo-induced two-body loss of ultracold molecules
• Sticky collisions of ultracold RbCs molecules
• Hyperfine Coherence in the Presence of Spontaneous Photon Scattering
• Observation of Collisions between Two Ultracold Ground-State CaF Molecules
• Modeling the adiabatic creation of ultracold, polar ${}^{23}\mathrm{N}{\mathrm{a}}^{40}\mathrm{K}$ molecules
• Fast Quantum State Control of a Single Trapped Neutral Atom
• Grey-molasses optical-tweezer loading: Controlling collisions for scaling atom-array assembly
• Magic wavelengths for the np-ns transitions in alkali-metal atoms
• A robust entangling gate for polar molecules using magnetic and microwave fields
• Forming a single molecule by magnetoassociation in an optical tweezer
• Molecular assembly of ground state cooled single atoms
• Frequency-dependent polarizabilities of alkali atoms from ultraviolet through infrared spectral regions
• Production of optically trapped ${}^{87}$RbCs Feshbach molecules
• Controlling the Rotational and Hyperfine State of Ultracold ${}^{87}$Rb${}^{133}$Cs Molecules
• Study of light-assisted collisions between a few cold atoms in a microscopic dipole trap
• Single-atom trapping and transport in DMD-controlled optical tweezers
• Sympathetic cooling and collisional properties of a Rb-Cs mixture
• Dipolar Collisions of Ultracold Ground-state Bosonic Molecules
• Framework for simulating gauge theories with dipolar spin systems
• Eliminating light shifts in single-atom optical traps
• Direct Measurements of Collisional Dynamics in Cold Atom Triads
• Sideband cooling of molecules in optical traps
• AC Stark Effect in Ultracold Polar RbCs Molecules
• Unified model of ultracold molecular collisions
• Preparation of a Heteronuclear Two-atom System in the 3D Motional Ground State in an Optical Tweezer
• Interaction induced decay of a heteronuclear two-atom system
• Controlling the ac Stark effect of RbCs with dc electric and magnetic fields
• Magnetic trapping of a cold Rb-Cs atomic mixture
• Zeeman-insensitive cooling of a single atom to its two-dimensional motional ground state in tightly focused optical tweezers
• Thermally-robust spin correlations between two 85Rb atoms in an optical microtrap
• Coherent Manipulation of the Internal State of Ultracold ${}^{87}$Rb${}^{133}$Cs Molecules with Multiple Microwave Fields
• Number-resolved imaging of ${}^{88}$Sr atoms in a long working distance optical tweezer
• Versatile electric fields for the manipulation of ultracold NaK molecules

Cited by in corpus (18)

• A dual-element, two-dimensional atom array with continuous-mode operation
• Formation of ultracold molecules by merging optical tweezers
• Parallel assembly of arbitrary defect-free atom arrays with a multi-tweezer algorithm
• Long-lived entanglement of molecules in magic-wavelength optical tweezers
• Enhanced quantum control of individual ultracold molecules using optical tweezer arrays
• Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule
• Single temporal-pulse-modulated parameterized controlled-phase gate for Rydberg atoms
• D1 magic wavelength tweezers for scaling atom arrays
• Ultracold ${}^{88}{\mathrm{Sr}}_2$ molecules in the absolute ground state
• Preparation of ${}^{87}$Rb and ${}^{133}$Cs in the motional ground state of a single optical tweezer
• A hybrid atom tweezer array of nuclear spin and optical clock qubits
• Efficient Pathway to NaCs Ground State Molecules
• Individual assembly of two-species Rydberg molecules using optical tweezers
• Long-lived multilevel coherences and spin-1 dynamics encoded in the rotational states of ultracold molecules
• Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers
• State Carving in a Chirally-Coupled Atom-Nanophotonic Cavity
• Robust storage qubits in ultracold polar molecules
• Dual-species Optical tweezer for Rb and K atoms