Entanglement distribution in hybrid discrete- and continuous-variable microwave networks

Distributing entanglement between spatially separated nodes of a large-scale quantum network is a fundamentally important milestone for quantum information processing tasks. In particular, quantum entanglement is needed for quantum teleportation or logical quantum gates with remote qubits. In our experiment, we employ a superconducting transmon qubit in a superconducting 3D cavity coupled to a microwave two-mode squeezed (TMS) bath. The latter is provided by externally flux-driven Josephson parametric amplifiers. We experimentally investigate a build-up of entanglement between the remote superconducting nodes due to their interaction with the common, quantum-correlated, reservoir. The corresponding entanglement conversion between continuous- and discrete-variables allows for promising and robust quantum microwave network architectures. Finally, we discuss possible extensions and applications for distributed quantum computing.