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SYQI: Symposium Quantum Information and the Quest for Fault-Tolerant Quantum Computing

SYQI 1: Quantum Information and the Quest for Fault-Tolerant Quantum Computing

SYQI 1.3: Hauptvortrag

Mittwoch, 10. September 2025, 12:05–12:45, ZHG010

New opportunities in hybrid atom arrays combining single atoms and ensembles — •Wenchao Xu — ETH Zurich

Neutral-atom array platforms have advanced rapidly in recent years and are now among the leading candidates for realizing quantum technologies. However, achieving fault-tolerant quantum computation requires overcoming key challenges, including reconfigurable individual qubit addressability, fast, mid-circuit readout, and scaling beyond 10,000 qubits.

To tackle these limitations, we are developing a novel dual-type, dual-species atom array architecture. In our approach, single ytterbium (Yb) atoms*with their long nuclear spin coherence times*serve as data qubits, while rubidium (Rb) atomic ensembles*with their strong collective optical response*function as ancilla. This combination enables reconfigurable local operations, fast and non-destructive readout of both single- and multi-qubit states and introduces a new scheme for establishing quantum optical links. As part of this effort, we are currently conducting spectroscopic measurements of Yb*Rb Rydberg pair interactions. These studies will benchmark theoretical models of Rydberg states in multi-valence-electron atoms and lay the groundwork for experimental realization of our proposed architecture.

Keywords: Atom array; quantum computing