Superconducting quantum node for entanglement and storage of microwave   radiation
  Superconducting circuits and microwave signals are good candidates to realize quantum networks, which are the backbone of quantum computers. We have realized a quantum node based on a 3D microwave superconducting cavity parametrically coupled to a transmission line by a Josephson ring modulator. We first demonstrate the time-controlled capture, storage and retrieval of an optimally shaped propagating microwave field, with an efficiency as high as 80%. We then demonstrate a second essential ability, which is the timed-controlled generation of an entangled state distributed between the node and a microwave channel. 
Emmanuel Flurin, Nicolas Roch, Jean-Damien Pillet, Fran\c{c}ois   Mallet, Benjamin Huard
quant-ph cond-mat.mes-hall