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Researchers at the University of Michigan have demonstrated a dual-metastable encoding scheme for ytterbium-171 atoms that allows single qubits to handle both storage and processing tasks without disrupting neighbors. By utilizing distinct nuclear-spin and hyperfine-spin states, this architecture achieves rapid Raman operations and extended coherence times essential for scaling neutral-atom quantum processors toward fault tolerance. This advancement directly addresses spectral limitations in previous designs by creating spectrally separated zones that simplify qubit assignment and reduce unwanted interactions.

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Ytterbium Atoms Encode Quantum Data Using Two Independent States

Quantum ZeitgeistJune 10, 20266 min read

Can a single atom reliably both store quantum information and rapidly process it without disrupting nearby qubits? A new encoding scheme for ytterbium atoms achieves this by utilising two distinct internal states within the same atom, integrating mid-circuit measurements and fast operations on a single platform. This dual-metastable approach promises to reduce the complexity of building practical, fault-tolerant quantum computers.

Scientists at the University of Michigan, led by Chun-Wei Liu, have unveiled a new qubit encoding architecture for neutral-atom arrays utilising 171Yb atoms. The architecture employs a dual metastable-state approach, leveraging both nuclear-spin and hyperfine-spin qubits within distinct energy manifolds to enhance quantum information processing. This innovative design enables extended coherence times suitable for both quantum storage and arithmetic operations. It also facilitates swift Raman operations and direct, state-selective imaging facilitated by a hyperfine frequency of $2π\times 6.7~\mathrm{GHz}$. By seamlessly integrating mid-circuit measurements and rapid qubit operations on a single platform, the research presents a versatile framework with the potential to…

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