Active resonator depletion with short microwave pulses

TL;DR

This paper introduces a physical model for photon depletion in superconducting microwave resonators using short pulses, enabling faster qubit reset times in quantum computing systems.

Contribution

It presents a novel model explaining photon depletion via short microwave pulses and discusses optimal pulse matching for rapid qubit reset in superconducting circuits.

Findings

Model accurately predicts photon depletion dynamics

Optimal pulse parameters significantly reduce reset times

Reassessment of assumptions for wide-band pulses

Abstract

We propose a physical model to explain the phenomenon of photon depletion in superconducting microwave resonators in the dispersive regime, coupled to Josephson junction qubits, via short microwave pulses. We discuss the conditions for matching the amplitude and phase of the pulse optimally within the framework of the model, allowing for significant reductions in reset times after measurement of the qubits. We consider how to deal with pulses and transient dynamics within the input-output formalism, along with a reassessment of the underlying assumptions for a wide-band pulse.