On-Chip Josephson Junction Microwave Switch

TL;DR

This paper presents a superconducting microwave switch using a Josephson junction, demonstrating high performance with broad bandwidth, low loss, and high on/off ratio, suitable for quantum computing and microwave applications.

Contribution

It introduces a novel on-chip Josephson junction microwave switch with experimental validation and simulation-based extension to a double-throw configuration.

Findings

2 GHz bandwidth at 10 GHz center frequency

Low insertion loss and >20 dB on/off ratio

Performance matches simulations up to -100 dBm input power

Abstract

The authors report on the design and measurement of a reflective single-pole single-throw microwave switch with no internal power dissipation, based on a superconducting circuit containing a single Josephson junction. The data demonstrate the switch operation with 2 GHz instantaneous bandwidth centered at 10 GHz, low insertion loss, and better than 20 dB on/off ratio. The switch's measured performance agrees well with simulations for input powers up to -100 dBm. An extension of the demonstrated circuit to implement a single-pole double-throw switch is shown in simulation.