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Harvard researchers have demonstrated that neutral-atom quantum processors can maintain high-fidelity entangled circuits for ten hours using loss postselection, a significant step toward fault-tolerant computation. By filtering out events where atoms are lost, the team achieved 99.941% fidelity in CZ gates and successfully created and dismantled cluster states, proving robust control over complex quantum dynamics. This architectural approach offers a viable pathway to error mitigation without requiring immediate hardware modifications.

Sources coveringQuantum Zeitgeist, arXiv

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Entangled circuits maintained fidelity for ten hours.

Quantum ZeitgeistOctober 12, 20265 min read

Neutral-atom quantum processors achieved 99.941(3)% fidelity in entangling CZ gates, with stable performance of these entangled circuits maintained for ten hours.

Researchers at Harvard University achieved 99.941(3)% fidelity in entangling CZ gates using a neutral atom quantum processor, a result enabled by a technique. This performance, detailed in a new paper, represents stable operation for ten hours and builds on a raw fidelity of 99.854(4)%. The team then used these low-error gates to both create and disentangle cluster states, demonstrating control that is important for complex quantum algorithms and ultimately enabling efficient fault-tolerant quantum computation. Employing a technique called loss postselection, scientists achieved 99.941(3)% fidelity in entangling CZ gates, a substantial improvement over the 99.854(4)% fidelity attained without the method and demonstrating a potential…

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