Dual-Species Neutral Atom Quantum Processors

Arrays of optically trapped neutral atoms have emerged as a versatile and powerful architecture for quantum information processing, featuring high-fidelity Rydberg gates and programmable any-to-any qubit connectivity with hundreds of qubits. Due in part to their long coherence times and excellent measurement discrimination fidelities, neutral atom arrays are ideal platforms for exploring measurement-based protocols and real-time in-sequence quantum feedback control, including quantum error correction. In this talk, I will discuss how introducing a second atomic species in the array enables crosstalk-free mid-circuit measurements that can be used to measure and control a primary species. We use measurements on the second species (auxiliary qubits) to correct correlated phase errors on the first species (data qubits) using in-sequence feedback. Furthermore, I will discuss the richness of Rydberg interaction regimes that can be accessed in the system and how we achieve enhanced interspecies Rydberg interactions using a Forster resonance. In this regime, we demonstrate interspecies Rydberg blockade and use this blockade to generate Bell states between hyperfine qubits of different atomic elements (Rb and Cs). Lastly, I will discuss how we combine this interspecies entanglement with native mid-circuit readout to achieve quantum non-demolition measurements of data qubits utilizing a set of auxiliary qubits. These new measurement capabilities, combined with the richness of Rydberg interactions, open up compelling directions in quantum state control, quantum feedback, and many-body physics.