Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Z71: Lumped-Element Parametric Amplifiers and Circulators
11:30 AM–2:18 PM,
Friday, March 10, 2023
Room: Room 407/408
Sponsoring
Unit:
DQI
Chair: Olivia Lanes, IBM TJ Watson Research Center
Abstract: Z71.00001 : SQUID-Based Broadband Microwave Isolator
11:30 AM–11:42 AM
Presenter:
Matthew A Beck
(IBM TJ Watson Research Center)
Author:
Matthew A Beck
(IBM TJ Watson Research Center)
As an alternative we describe a circuit level broadband microwave isolator utilizing DC-SQUIDs. Employing a bandpass filter topology, we replace a portion of the shunt inductance of every filter pole with an equivalent DC-SQUID. With appropriate application of DC and microwave flux drives to each of the DC-SQUIDs, power at the signal frequency travelling in one direction remains at the signal frequency while power flowing in the opposite direction is dispersed amongst one or more sidebands stemming from 3-wave mixing processes.
To demonstrate the feasibility of such devices in replacing current isolator technology, we will present measured data on a variety of nanofabricated devices The data shows excellent model-hardware correlation with directionality greater than 15 dB for bandwidths approaching 700 MHz with minimal insertion loss. We will also describe how such devices can also be used for directional amplification.
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