Identify and Quantify Various Dissipation Mechanisms of Josephson Junction in Superconducting Circuits

TL;DR

This paper introduces a novel resonator platform to identify and quantify different dissipation mechanisms in Josephson junctions, providing insights for optimizing superconducting circuit performance.

Contribution

The work demonstrates the use of a junction-embedded resonator to systematically distinguish and measure internal and external dissipation mechanisms in Josephson junctions.

Findings

Different dissipation mechanisms exhibit distinct behaviors.

Quantitative characterization of dissipation contributions.

Guidance for Josephson junction optimization.

Abstract

Pinpointing the dissipation mechanisms and evaluating their impacts to the performance of Josephson junction (JJ) are crucial for its application in superconducting circuits. In this work, we demonstrate the junction-embedded resonator (JER) as a platform which enables us to identify and quantify various dissipation mechanisms of JJ. JER is constructed by embedding JJ in the middle of an open-circuit, 1/2 {\lambda} transmission-line resonator. When the 1st and 2nd harmonics of JER are excited, JJ experiences different boundary conditions, and is dominated by internal and external dissipations, respectively. We systematically study these 2 dissipation mechanisms of JJ by varying the JJ area and number. Our results unveil the completely different behaviors of these 2 dissipation mechanisms, and quantitatively characterize their contributions, shedding a light on the direction of JJ optimization in various applications.