3He-4He Dilution Refrigerator (IMAGE) Universitaet Stuttgart Caption Using a 3He-4He dilution refrigerator, microwave experiments can be performed at extremely low temperatures: a few hundredths of a degree above absolute zero. Credit University of Stuttgart, Constantin Dressel Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.