Anuj Aggarwal, Avdelningen för kvantteknologi

Sammafattning:

Flux-tunable qubits and couplers have become crucial components in superconducting quantum
processors. However, dynamically controlling their frequency via flux pulses poses challenges due
to distortions and transients in the flux control signal. In particular, long-time transients can persist, adversely affecting subsequent qubit control operations and degrading overall processor performances.
In this seminar, we show that the flux control line can be modelled as a first-order RC circuit, and we introduce a novel class of flux pulses designed to mitigate these transients. We experimentally demonstrate the suppression of transients using an example pulse on a flux-tunable coupler. The proposed pulse design offers a practical solution for mitigating long-time transients, enabling efficient and reliable experiment tune-ups without requiring detailed flux line characterization.

Diskussionsledare: Gasparinetti Simone, Professor, QT

Huvudhandledare: Sammarco Tancredi Giovanna, Senior forskare, QT

Biträdande handledare: Jonas Bylander, Professor, QT

Examinator: Per Delsing, Professor, QT