Superconducting quantum node for entanglement and storage of microwave radiation

Understand

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.