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Articles by Patrick Winkel
[2610.36067] Diagonal, Switching, and Locally Optimal Unraveling for efficient quantum trajectories in metastable open quantum systems
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Low-loss lumped-element inductors made from granular aluminum
Lumped-element inductors are an integral component in the circuit QED toolbox. However, it is challenging to build inductors that are simultaneously compact, linear, and low-loss with standard approaches that either rely on the geometric inductance of superconducting thin films or on the kinetic inductance of Josephson-junction arrays. In this work, we overcome this challenge by utilizing the high kinetic inductance offered by superconducting granular aluminum (grAl).
A superconducting dual-rail cavity qubit with erasure-detected logical measurements - Nature Physics
Abstract A critical challenge in developing scalable quantum systems is correcting the accumulation of errors while performing operations and measurements. It is known that systems where dominant errors can be detected and converted into erasures have relaxed requirements for quantum error correction. Recently, it has been proposed that this can be achieved using a dual-rail encoding of quantum information in the microwave photon states of two superconducting cavities.
Publisher Correction: Observation of Josephson harmonics in tunnel junctions - Nature Physics
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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’.
By Dennis Willsch, Dennis Rieger, Patrick Winkel, Madita Willsch, Christian Dickel, Jonas Krause, Yoichi Ando, Nicholas T. Bronn, Zlatko K. Minev, Simon Günzler, Patrick Paluch, Thomas Reisinger, Roudy Hanna, Peter Schüffelgen, Detlev Grützmacher, Luiza Buimaga-Iarinca, Wolfgang Wernsdorfer, David DiVincenzo, Kristel Michielsen, Gianluigi Catelani
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Nature
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Observation of Josephson harmonics in tunnel junctions - Nature Physics
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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.
By Dennis Willsch, Dennis Rieger, Patrick Winkel, Madita Willsch, Christian Dickel, Jonas Krause, Yoichi Ando, Nicholas T. Bronn, Zlatko K. Minev, Simon Günzler, Patrick Paluch, Thomas Reisinger, Roudy Hanna, Peter Schüffelgen, Detlev Grützmacher, Luiza Buimaga-Iarinca, Wolfgang Wernsdorfer, David DiVincenzo, Kristel Michielsen, Gianluigi Catelani
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Nature
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Two-level system hyperpolarization using a quantum Szilard engine - Nature Physics
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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