Quantum Engineering of a Low-Entropy Gas of Heteronuclear Bosonic Molecules in an Optical Lattice

Abstract

We demonstrate a generally applicable technique for mixing two-species quantum degenerate bosonic samples in the presence of an optical lattice, and we employ it to produce low-entropy samples of ultracold 87Rb133Cs Feshbach molecules with a lattice filling fraction exceeding 30%. Starting from two spatially separated Bose-Einstein condensates of Rb and Cs atoms, Rb-Cs atom pairs are efficiently produced by using the superfluid-to-Mott insulator quantum phase transition twice, first for the Cs sample, then for the Rb sample, after nulling the Rb-Cs interaction at a Feshbach resonance's zero crossing. We form molecules out of atom pairs and characterize the mixing process in terms of sample overlap and mixing speed. The dense and ultracold sample of more than 5000 RbCs molecules is an ideal starting point for experiments in the context of quantum many-body physics with long-range dipolar interactions.

10 pages, 6 figures (4 in the main text, 2 in Supplemental Material)

References in corpus (10)

• A High Phase-Space-Density Gas of Polar Molecules
• 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
• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Quantum Gas of Deeply Bound Ground State Molecules
• Coherent optical transfer of Feshbach molecules to a lower vibrational state
• Phase diagram for a Bose-Einstein condensate moving in an optical lattice
• Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields
• Production of a dual-species Bose-Einstein condensate of Rb and Cs atoms
• Superfluid-insulator transition in a moving system of interacting bosons

Cited by in corpus (40)

• Cold molecules: Progress in Quantum Engineering of Chemistry and Quantum Matter
• New frontiers with quantum gases of polar molecules
• Probing site-resolved correlations in a spin system of ultracold molecules
• Modeling the adiabatic creation of ultracold, polar ${}^{23}\mathrm{N}{\mathrm{a}}^{40}\mathrm{K}$ molecules
• Collisions of ultracold molecules in bright and dark optical dipole traps
• Forming a single molecule by magnetoassociation in an optical tweezer
• Defect-free arbitrary-geometry assembly of mixed-species atom arrays
• Formation of ultracold molecules by merging optical tweezers
• Remote entanglement via adiabatic passage using a tunably-dissipative quantum communication system
• Microwave shielding of bosonic NaRb molecules
• Enriching the quantum toolbox of ultracold molecules with Rydberg atoms
• Observation of interspecies Feshbach resonances in an ultracold ${}^{39}$K-${}^{133}$Cs mixture and refinement of interaction potentials
• Seconds-scale coherence on nuclear spin transitions of ultracold polar molecules in 3D optical lattices
• Staggered superfluid phases of dipolar bosons in two-dimensional square lattices
• Controlling the ac Stark effect of RbCs with dc electric and magnetic fields
• A High Phase-Space Density Gas of NaCs Feshbach Molecules
• Accuracy of quantum simulators with ultracold dipolar molecules: a quantitative comparison between continuum and lattice descriptions
• Quantum Many-Body Physics with Ultracold Polar Molecules: Nanostructured Potential Barriers and Interactions
• Magic Conditions for Multiple Rotational States of Bialkali Molecules in Optical Lattices
• Superfluid phases induced by the dipolar interactions
• Synchronization transition in dipole-coupled two-level systems with positional disorder
• Active stabilization of kilogauss magnetic fields to the ppm level for magnetoassociation on ultranarrow Feshbach resonances
• Localized dynamics following a quantum quench in a non-integrable system: An example on the sawtooth ladder
• Monte Carlo based techniques for quantum magnets with long-range interactions
• Laser control of ultracold molecule formation: The case of RbSr
• Quantum phases of dipolar bosons in one-dimensional optical lattices
• Photoassociation of ultracold long-range polyatomic molecules
• Observation of confinement-induced resonances in a 3D lattice
• Systematic Analysis of Crystalline Phases in Bosonic Lattice Models with Algebraically Decaying Density-Density Interactions
• Long distance optical conveyor-belt transport of ultracold ${}^{133}$Cs and ${}^{87}$Rb atoms
• Nondestructive dispersive imaging of rotationally excited ultracold molecules
• Realizing multiband states with ultracold dipolar quantum simulators
• Quantum phases of hardcore bosons with repulsive dipolar density-density interactions on two-dimensional lattices
• Dipolar Bose-Hubbard Model in finite-size real-space cylindrical lattices
• Emergent Mott-insulators at non-integer fillings and devil's staircase induced by attractive interaction in many-body polarons
• Bloch oscillations in interacting systems driven by a time-dependent magnetic field
• Multi-state detection and spatial addressing in a microscope for ultracold molecules
• Formation of ultracold ${}^{39}$K${}^{133}$Cs Feshbach molecules
• Strongly dipolar molecular Bose-Einstein condensates: From few- to many-body physics
• Miscibility-Immiscibility transition of strongly interacting bosonic mixtures in optical lattices