Resonant microwave properties of a voltage-biased single-Cooper-pair transistor

TL;DR

This paper investigates how microwave fields influence the transport and dynamics of a voltage-biased single-Cooper-pair transistor, revealing interference effects that cause sensitive dependence of the Josephson current on bias and microwave frequency.

Contribution

It provides a detailed analysis of microwave-induced interference effects on the Josephson current in a single-Cooper-pair transistor, highlighting the sensitivity to bias voltage and microwave frequency.

Findings

Josephson current is highly sensitive to bias voltage variations.

Microwave-induced inter-level transition interference significantly affects device behavior.

The dynamics are strongly influenced by microwave frequency changes.

Abstract

We consider the microwave dynamics and transport properties of a voltage-biased single-Cooper-pair transistor. The dynamics is shown to be strongly affected by interference between multiple microwave-induced inter-level transitions. As a result the magnitude and direction of the dc Josephson current are extremely sensitive to small variations of the bias voltage and to changes in the frequency of the microwave field.