Author

W. Wernsdorfer

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Preprint Oct 2026

Superconducting circuits host two-level systems with lifetimes exceeding one second

Understanding the microscopic environment of superconducting qubits is a central challenge for quantum technologies. Parasitic two-level systems (TLSs) of various microscopic origins are ubiquitous and limit qubit performance through decoherence, frequency drifts, and leakage. Recently, long-lived TLSs with lifetimes e...

Mathieu Féchant, P. Lenhard, N. Gosling et al. · 0 citations

Preprint Aug 2026

An ultracompact dilution refrigerator for fast quantum device characterization

Rapid thermal cycling is a central bottleneck in the development of superconducting quantum devices: conventional dilution refrigerators require cooldowns of a day or more and substantial cryogenic infrastructure, which throttles the fabricate-measure-redesign loop. We present an ultracompact dilution refrigerator (3 k...

Clḿent Geffroy, Dorian Nicolas, Eric Eyraud et al. · 0 citations

Preprint Sep 2026

Parametric two-qubit gates via Landau-Zener interference

We propose and demonstrate gates between two superconducting qubits based on quantum interference of consecutive Landau-Zener (LZ) transitions. This gate mechanism bridges between baseband and parametric two-qubit control, enabling in situ tuning of the control frequency across a continuous interval up to hundreds of M...

S. Geisert, A. Hertel, Soeren Ihssen et al. · 1 citation