Limits RegistryPUBLIC RECORD
Limits RegistryA 2023 collaboration led by researchers at Fermilab and Rutgers reported a fluxonium-type superconducting qubit with a T1 coherence time of roughly 1.5 milliseconds, well beyond the tens-of-microseconds range typical of standard transmon qubits used in most large-scale processors (including Google's and IBM's). Longer coherence gives more time for computation before information is lost to the environment, though fluxonium qubits bring their own fabrication and control tradeoffs versus transmons.
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A 2023 collaboration led by researchers at Fermilab and Rutgers reported a fluxonium-type superconducting qubit with a T1 coherence time of roughly 1.5 milliseconds, well beyond the tens-of-microseconds range typical of standard transmon qubits used in most large-scale processors (including Google's and IBM's). Longer coherence gives more time for computation before information is lost to the environment, though fluxonium qubits bring their own fabrication and control tradeoffs versus transmons.
The longest T1 energy-relaxation time reported for a superconducting qubit design in a peer-reviewed publication.
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The frontier as it changed over time.
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1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-SUPERCONDUCTING-QUBIT-COHERENCE
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Limits Registry. LR-SUPERCONDUCTING-QUBIT-COHERENCE. Longest coherence time in a superconducting qubit. 2026.