Pump 'n' Dump - High Fidelity Communication with Lossy Microwave Links: Part 1

Short-distance modular quantum networks allow us to build more complex quantum devices from simpler ones, provided we are not limited by our interconnects. Superconducting cavity modules within a single dilution refrigerator can be networked together over centimeter to meter scale distances with microwave transmission line (or waveguide) links. However, quantum communication is typically limited by loss in the links connecting the modules. Given that the modes of our cavities and link exist in the 1-10 GHz regime, we can actuate the coupling between our cavities and a single standing wave mode of our link. This provides us a new way to generate heralded entanglement between the modules which we call ‘Pump ‘n’ Dump’. Our scheme not only completely avoids loss in the link, but has a loss-independent success probability of 50%.