Charge transport through ultrasmall single and double Josephson junctions coupled to resonant modes of the electromagnetic environment

TL;DR

This paper studies charge transport in ultrasmall Josephson junctions coupled to electromagnetic resonant modes, revealing current peaks due to Cooper pair tunneling and photon emission, supported by experimental and theoretical analysis.

Contribution

It demonstrates the interplay between Cooper pair tunneling and photon emission in ultrasmall Josephson junctions, with experimental results matching theoretical models.

Findings

Pronounced current peaks observed in transport characteristics

Current peaks attributed to Cooper pair tunneling and photon emission

Experimental data aligns with theoretical models

Abstract

We have investigated charge transport in ultrasmall superconducting single and double Josephson junctions coupled to resonant modes of the electromagnetic environment. We observe pronounced current peaks in the transport characteristics of both types of devices and attribute them to the process involving simultaneous tunneling of Cooper pairs and photon emission into the resonant modes. The experimental data is well reproduced with the theoretical models.