Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Microwave SQUID multiplexer

Published

Author(s)

Kent D. Irwin, Konrad Lehnert

Abstract

We describe a superconducting quantum interference device (SQUID) multiplexer operated at microwave frequencies. The outputs of multiple SQUIDs are simultaneously modulated at different frequencies, frequency-division multiplexed, and amplified using a high electron mobility transistor (HEMT). The large bandwidth and dynamic range provided by HEMT amplifiers should make it possible to multiplex a large number of SQUIDs in one output coaxial cable. We measure good SQUID noise performance and demonstrate the multiplexed readout of two dc SQUIDs at different resonant frequencies. In this work dc SQUIDs are used, but this approach is equally applicable to rf SQUIDs.
Citation
Applied Physics Letters
Volume
85
Issue
11

Keywords

HEMT, multiplexer, SQUID

Citation

Irwin, K. and Lehnert, K. (2004), Microwave SQUID multiplexer, Applied Physics Letters (Accessed February 23, 2024)
Created September 12, 2004, Updated October 12, 2021