PhD in Quantum Networking with Trapped Ions

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University of Sussex
3 February, 2017


University of Sussex
Pevensey 2
Brighton BN19QH
United Kingdom
50° 51' 56.6388" N, 0° 5' 8.0916" W

PhD Studentships in Quantum Networking with Atomic Ions

A 3 year PhD position is available in the ICTM-Group in the Department of Physics & Astronomy at the University of Sussex and the National Physical Laboratory.

The positions come with an annual stipend of £14,057 which can be supplemented by tutoring. The position includes a yearly travel allowance.

Applicants should have an undergraduate degree in physics or similar.

For more information please contact Dr Matthias Keller (m [dot] k [dot] keller [at] sussex [dot] ac [dot] uk) and visit the group’s web page at

The project unites two distinct areas of quantum information processing, single ions stored in radio-frequency traps, and single photons in optical fibres. In both fields, there have been spectacular advances recently. Strings of ions are presently the most successful implementation of quantum computing, with elementary quantum algorithms and quantum simulations realized. Photons are used to distribute entanglement over ever increasing distances. The principal challenge in the field is to enhance quantum processing power by scaling up current devices to larger quantum systems. We are pursuing one of the most promising strategies, distributed quantum computation, in which multiple small-scale ion processors are interlinked by exchanging photonic quantum bits via optical fibres. It requires a coherent quantum interface between ions and photons, mapping ionic to photonic quantum states and vice versa. To maximise fidelity and success rate of the scheme, the interaction of ions and photons must take place in a microscopic optical cavity with high finesse, a technology in which the Ion Trap Cavity-QED and Molecular Physics group in Sussex has a leading international role. To achieve ultra-small trap and cavity volumes, we use the fibre ends as cavity mirrors and tightly integrate them into the ion trap structure.

The project is within the Quantum Technology Hub for Networked Quantum Information Technologies and in collaboration with the National Physical Laboratory.

The first year of the project is located at the NPL in London to set up and test a novel ion trap design which is based on micro-fabricated structures. In years two and three, the ion tap structure will be combined with laser machined fibre cavities and the ion-cavity coupling will be employed to demonstrate a high fidelity ion-photon entanglement at the University of Sussex. The project provides hands-on training from the construction of state-of-the-art ion trap quantum computing systems through to the implementation of quantum state transfers and entanglement generation.

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