5 papers · 1 filter
In situ calibration of microwave attenuation and gain using a cryogenic on-chip attenuator
Thomas Descamps, Linus Andersson, Vittorio Buccheri +3
Accurate in situ calibration of microwave attenuation and amplification-chain noise is essential for superconducting quantum circuits. We demonstrate a compact, self-calibrating cr…
Real-time detection of correlated quasiparticle tunneling events in a multi-qubit superconducting device
Simon Sundelin, Linus Andersson, Hampus Brunander +1
Quasiparticle tunneling events are a source of decoherence and correlated errors in superconducting circuits. Understanding and ultimately mitigating these errors calls for real-ti…
Automated, physics-guided, multi-parameter design optimization for superconducting quantum devices
Axel M. Eriksson, Lukas J. Splitthoff, Harsh Vardhan Upadhyay +5
The design of nonlinear superconducting quantum circuits often relies on time-consuming iterative electromagnetic simulations requiring manual intervention. These interventions ent…
Co-designed reflective and leaky-waveguide low-pass filter for superconducting circuits
Linus Andersson, Benjamin Olsson, Simone Gasparinetti +1
A stepped-impedance low-pass filter with integrated hollow waveguide absorbers is presented. The filter combines low insertion loss in the passband with strong attenuation at high…
Direct detection of quasiparticle tunneling with a charge-sensitive superconducting sensor coupled to a waveguide
Kazi Rafsanjani Amin, Axel M. Eriksson, Mikael Kervinen +3
Detecting quasiparticle tunneling events in superconducting circuits provides information about the population and dynamics of non-equilibrium quasiparticles. Such events can be de…