Towards a Quantum Network with Waveguide Quantum Electrodynamics

Abstract

Over the past twenty years, the field of quantum computing has progressed from the investigation of individual quantum systems towards the implementation of manyqubit processors. Distributing information processing over a quantum network consisting of many nodes that communicate via itinerant photons is one potential framework for achieving modular and extensible quantum computation. Systems of superconducting qubits strongly coupled to a continuum of photonic modes in 1D coplanar waveguides, described by the formalism known as waveguide Quantum Electrodynamics (wQED), are emerging as a promising platform for quantum communication. In this work, we develop a quantum module comprised of superconducting qubits strongly coupled to a 1D waveguide that can bidirectionally emit and absorb propagating microwave photons on-demand. These modules can be tiled in series along a waveguide to form an all-to-all, extensible quantum network.