A hybrid atom-superconductor interface for quantum networking

Lead Research Organisation: University of Strathclyde
Department Name: Physics

Abstract

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.

Publications

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Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/P510270/1 31/03/2016 30/08/2022
1918300 Studentship EP/P510270/1 24/09/2017 30/03/2022 Lindsey Frances Keary
 
Description We have made progress towards generating resonators for 4K operation but due to COVID progress significantly slowed and project adapted to accommodate loss of time by changing to trapping atoms in cryogenic environment and performing numerical studies of atom-cavity interactions.
Exploitation Route Progress is still being made towards the ultimate goal of realising an atom-superconducting resonator interface so in the future this work could be taken forward to realise such a device. Additionally we are aiming to publish our numerical simulation and resonator characterisation results which could be put to use by others.
Sectors Digital/Communication/Information Technologies (including Software)

 
Description As part of this project explored development of NbN superconducting films which have potential impact for developing cryogenic electronics at 4K relevant for efforts in quantum computing and linked to forthcoming IUK projects that will develop this for industrial applications
First Year Of Impact 2020
Sector Other