Towards a dual-type dual-element quantum processor

Luis Fernandez Martinez

PhD Student, Experimental Quantum Engineering Group, ETH

Abstract

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Neutral-atom arrays have emerged as one of the most promising platforms for quantum simulation and computation, with recent experiments demonstrating analog–digital simulation and progress toward fault tolerance. Two key challenges remain: mid-circuit readout—essential for error correction—is slow, and arbitrary local addressing is still limited. We are building a hybrid architecture that combines single ytterbium atoms as data qubits with small rubidium ensembles as ancillas. This enables fast, non-destructive mid-circuit readout and selective local control while preserving the long coherence times of individual atoms. Our simulations predict single- and multi-qubit gate fidelities of 99.5% and 99.9%, respectively, and readout fidelities above 99% within tens of microseconds. In this talk, we will explain the neutral atom platform, why our proposal matters and where our experiment stands today.