Directional Amplification with a Josephson Circuit
Baleegh Abdo, Katrina Sliwa, Luigi Frunzio, Michel Devoret · Physical Review X · 2013
Amplification of weak signals in quantum information processing requires components that prevent return of noise through amplification chain. A directional amplifier based on the Josephson effect could overcome disadvantages of conventional isolators and allow components to be integrated on a chip.