This PhD project aims to demonstrate a fully functional quantum network node based on the NPL ion microtrap chip, a UK-developed, scalable 3D ion trap device. The project will integrate and characterise each component of the node independently before demonstrating their combined operation, culminating in the generation of ion-photon entanglement and a reproducible blueprint for future multi-node quantum networks.
Key Hardware Components:
- Ion Microtrap Chip: A segmented device with 11 experimental zones for ion loading, state preparation, qubit processing, and entanglement.
- Dual-Species Atomic Oven: Enables optimal selection of atomic transitions for local and photonic operations.
- Miniature Optical Cavity: Integrated around the ion trap to facilitate efficient ion-photon coupling while preserving optical access.
- Optical Coupling and Stabilisation System: Delivers and stabilises light in and out of the cavity using non-resonant wavelengths.
Research Objectives:
- Develop and characterise each subsystem independently using scalable, manufacturable techniques.
- Demonstrate ion trapping and ion-photon entanglement using NPL’s testbed and high-efficiency superconducting single-photon detectors.
- Validate the compatibility and performance of the integrated system.
- Produce a template for a reproducible, scalable quantum network node.
Research Context and Alignment with AQT CDT:
This project directly supports the UK’s National Quantum Strategy, particularly Missions 1 and 2, by advancing scalable quantum networking technologies. The NPL ion microtrap is the only UK-developed 3D trap with demonstrated operation and scalability, making it uniquely suited for modular ion-cavity network nodes. Its segmented architecture allows spatial separation of key functions, essential for distributed quantum computing.
The project complements ongoing efforts at NPL, the National Quantum Computing Centre, and the University of Oxford, and will contribute to the UK’s leadership in quantum hardware development. It also supports the growth of the UK quantum supply chain through collaboration with Kelvin Nanotechnology Ltd. and other industrial partners.