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Correction to: Nature Physics https://doi.org/10.1038/s41567-024-02400-8, published online 14 February 2024. In the version of the article initially published, references 87 and 88 were mistakenly swapped. They have now been corrected so that reference 87 is “Willsch, D. & Rieger, D. Spectroscopy data and model parameters for ‘Observation of Josephson harmonics in tunnel junctions’.
Abstract Approaches to developing large-scale superconducting quantum processors must cope with the numerous microscopic degrees of freedom that are ubiquitous in solid-state devices. State-of-the-art superconducting qubits employ aluminium oxide (AlOx) tunnel Josephson junctions as the sources of nonlinearity necessary to perform quantum operations. Analyses of these junctions typically assume an idealized, purely sinusoidal current–phase relation.
Abstract The innate complexity of solid-state physics exposes superconducting quantum circuits to interactions with uncontrolled degrees of freedom degrading their coherence. By implementing a quantum Szilard engine with an active feedback control loop, we show that a superconducting fluxonium qubit is coupled to a two-level system (TLS) environment of unknown origin, with a relatively long intrinsic energy relaxation time exceeding 50 ms.
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