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Engineered dissipation using symmetry-protected superconducting circuits

Project description

Controlling photon decay could open the door to qubit reset and readout

For slightly more than a decade, a new type of superconducting qubit has taken the quantum computing world by storm. The transmon, used in a pioneering controlled qubit-qubit interaction a few years ago, has now become an important tool for investigating multi-qubit phenomena. The EU-funded EDSP project will exploit this system to investigate the possibility of harnessing typically problematic dissipation and decoherence rather than fighting them to enable qubit state reset and photon-mediated fluorescence readout of the state of the qubit.

Objective

Dissipation is fundamental to physical systems. In quantum mechanics, this manifests itself as energy decay and dephasing also known as quantum decoherence. In the field of quantum computing, decoherence is often relegated as a non-ideality of the physical system. However, dissipation and decoherence are a necessary for quantum information processing; allowing measurement, state preparation, and quantum error correction. I propose to explore engineered multi-photon dissipation processes using superconducting circuits. By extending the well-established ‘transmon qubit’ platform, this work will investigate the use of symmetry to prevent single-photon decay while allowing two-photon and four-photon decay events. Such a mechanism has immediate applications akin to trapped-ion technology for qubit state reset and resonance fluorescence readout. In addition, possible multi-mode dissipative processes provide a rich physics to explore more complex quantum phenomena in larger systems. This includes entanglement stabilization and the generation of decoherence-free subspaces.

Coordinator

THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD
Net EU contribution
€ 224 933,76
Address
WELLINGTON SQUARE UNIVERSITY OFFICES
OX1 2JD Oxford
United Kingdom

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Region
South East (England) Berkshire, Buckinghamshire and Oxfordshire Oxfordshire
Activity type
Higher or Secondary Education Establishments
Links
Total cost
€ 224 933,76