Coaxial circuit QED grids for quantum computing

Lead Research Organisation: University of Oxford
Department Name: Oxford Physics


In circuit QED, a superconducting qubit is coupled to a microwave resonator, implementing cavity QED in an electrical circuit and providing a useful basis for superconducting circuit quantum computing. In Oxford we have recently developed a coaxial architecture of circuit QED which enables 2D grids of qubits to be implemented while keeping control and measurement wiring out of the qubit plane, enabling multi-qubit circuits to be developed without a requirement for complex on-chip wiring. This project will build on this realization to develop grids of 9-16 qubits to demonstrate the architecture's potential to scale up to a level that implements practical quantum computing. The aims of the project will be to build, measure and understand the behavior of 9-16 qubit circuits, and to explore methods to implement multi-qubit couplings and of quantum logic gates in such circuits. The student will work in collaboration with several other students and postdocs, and the team as a whole will work towards demonstrating quantum error correction and universal quantum computation in the coaxial architecture.

This project falls within the EPSRC research areas of 'Quantum Optics and Information' and 'Quantum Devices, Components and Systems


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Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/N509711/1 01/10/2016 30/09/2021
1753794 Studentship EP/N509711/1 01/10/2016 31/03/2020 Peter Anthony Spring
Description - novel Purcell filtering in a 3D architecture

- CNC and laser machining process compatibility with superconducting quantum devices fabrication

- Effects of via grids on superconducting quantum circuits - with applications for mediating long distance couplings between circuits
Exploitation Route - Developing scalable monolithic superconducting quantum computing architectures
Sectors Aerospace, Defence and Marine,Digital/Communication/Information Technologies (including Software),Electronics,Security and Diplomacy

Description -Research has lead to a patent application (Patent Application No. 1813188.8), that could strengthen the UK Quantum Computing industry. -Research has lead to consultancy work for OQC - a UK startup working on Superconducting Quantum Computing. This work may help OQC in its funding rounds.
First Year Of Impact 2018
Sector Digital/Communication/Information Technologies (including Software)
Impact Types Economic

Description Advanced CNC machining of silicon substrates 
Organisation University of Southampton
Country United Kingdom 
Sector Academic/University 
PI Contribution We provide Silicon substrates containing superconducting quantum circuits - and then characterise these devices after novel CNC processing.
Collaborator Contribution Setting up and operating CNC equipment for Silicon machining, including a Loxham drilling machine recently developed by the Loxham Precision Laboratory.
Impact We have found that superconducting devices are robust against CNC drilling processes.
Start Year 2018