A hybrid atom-superconductor interface for quantum networking

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Hybrid quantum systems combine two or more disparate quantum technologies to harness their individual strengths and overcome the limitations of each qubit type. Superconducting circuits are promising candidates for quantum processors as they perform fast high-fidelity gate operations but have short coherence times. Neutral atoms have the potential to fulfill the requirement for coherent storage of quantum information. Atomic transitions occur in both, the microwave and optical frequency range. Therefore, nodular quantum systems consisting of memory and processor qubits could be connected via optical channels to form a quantum network. The properties of atoms in highly excited Rydberg states in theory enable microwave cavity mediated long-distance entanglement between atomic ensembles and highly directional photon emission.The aim of this project is to develop a high-fidelity interface between superconducting and photonic qubits to realise an expansive quantum networking architecture. The long-term goal of this research is to advance the progress of circuit-QED quantum computing approaches with the inclusion of coherent quantum information storage and microwave-to-optical conversion. Therefore, generation of a chip-based device where atoms are coupled to superconducting circuits via a superconducting microwave resonator enables and deterministic entanglement of photonic qubits. Trapping atomic ensembles above a superconducting coplanar waveguide (CPW) and generating long-distance entanglement remains experimentally challenging but is an essential requirement to build a scalable quantum network.