An interacting dual-species optical tweezer array of Na and Cs atoms

Optical tweezer arrays of neutral atoms have proven to be a versatile platform for quantum science due to their precise controllability, flexible geometries, strong interactions mediated by Rydberg states, and scalability to high atom numbers. Dual-species arrays complement and extend these capabilities by incorporating two distinct atomic species, offering greater tunability of interatomic interactions and novel possibilities for local control and readout. Here, we demonstrate two-dimensional arbitrary-geometry tweezer arrays of sodium (23Na) and cesium (133Cs) atoms with coherent excitation to Rydberg states of each species. By selecting specific Rydberg states, we tune the interaction strengths between Na-Na, Cs-Cs, and Na-Cs pairs. We identify Rydberg states that produce strong interspecies interactions in comparison to weaker intraspecies interactions. Based on this, we can implement interspecies state transfer and species-selective readout, which are the key steps for many quantum error correction schemes. Beyond the extensively studied repulsive interactions in the single-species architecture, attractive interspecies interactions in dual-species systems expand the class of Hamiltonians that could be simulated with Rydberg atom tweezer arrays. These new features demonstrate the potential of dual-species arrays for advancing quantum science.