Toward terahertz heterodyne detection with superconducting Josephson nano-junctions

TL;DR

This paper investigates the high-frequency mixing capabilities of ion irradiated YBa2Cu3O7 Josephson nano-junctions, demonstrating their potential for terahertz heterodyne detection through experimental and theoretical analysis.

Contribution

It provides the first detailed study of the mixing properties of these nano-junctions across a wide frequency range, highlighting their suitability for terahertz applications.

Findings

Conversion gain matches three ports model predictions

Clear transition observed between mixing regimes

Potential for terahertz Josephson mixers discussed

Abstract

In this letter, we present the study of the high-frequency mixing properties of ion irradiated YBa2Cu3O7 Josephson nano-junctions. The frequency range, spanning above and below the characteristic frequencies fc of the junctions, permits clear observation of the transition between two mixing regimes. The experimental conversion gain was found to be in good agreement with the prediction of the three ports model. Finally, we discuss the potential of the junctions to build a Josephson mixer operating in the terahertz frequency range.