Researchers at the University of California at Berkeley and the Lawrence Berkeley National Lab have designed the first low-noise, high-gain, broad-bandwidth Josephson travelling wave parametric amplifier using a technique called “resonant phase matching”. The scheme boosts the gain in the amplifier by more than 10 dB compared with previous such devices, bringing its value up to 20 dB with a bandwidth of 3 GHz. The amplifier will be used for cryogenic broadband microwave measurements where low noise is critically important – such as in the multiplexed readout of quantum coherent circuits and in astronomical detectors that work at very low temperatures…..
http://nanotechweb.org/cws/article/tech/58990