Fig. 1: Square lattice microwave QLAN.
From: Cryogenic microwave link for quantum local area networks
Four superconducting quantum nodes within one plaquette are connected to each other via superconducting coaxial cables through respective cryogenic link arms. The bottom panel provides a more detailed schematic of the developed cryogenic link consisting of two quantum nodes (“Alice” and “Bob”) and an intermediate cold node (“Eve”), which are used for demonstration of a squeezed state transfer and entanglement distribution at microwave frequencies. Eve does not have a dilution unit and is used to assist cooling for the outer two layers of the cryolink. Local heating can be applied to the center part of the superconducting cables to test fundamental limits of quantum correlation propagation through a thermal environment.
