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Spin networks for quantum communication and computation


Project Description

Reliable quantum communication and/or information processing links between modules are a necessary building block for various quantum processing architectures. For example, scalability based on coherently connecting together small modular processors requires either high fidelity transfer of quantum states between processors, or shared entanglement to enable teleportation. While optical devices and systems are widely regarded as the most applicable candidates for long-range quantum communication, spin networks have acquired significant interest within the field of quantum information processing as a means of efficiently transferring information over short distances, for creating and/or distributing entanglement, and even performing quantum gates. Such model devices can be experimentally implemented for any connected system of two-level systems where it is possible to engineer the couplings between the systems (sites), making spin networks a versatile theoretical model to study in the context of hybrid quantum devices. Examples of physical implementations include electrons and excitons trapped in nanostructures, superconducting qubits, nanometre scale magnetic particles, or strings of fullerenes or other coupled molecules. Notably the physical properties of each potential hardware will naturally lead to specific spin network constraints, with a fixed allowed topology and strengths of interactions, as well as typical sources of noise and decoherence. These constraints may be considered as limitations, as they reduce the applicability of protocols derived from mathematical models. In this project we aim to understand and work with these physical limitations. The goal is to develop approaches to design physically implementable systems that incorporate bespoke, hardware-specific applications and functionalities relevant to various quantum processing requirements.
Our previous work on this subject includes:
1. Marta P. Estarellas, Irene D’Amico, Timothy P. Spiller, Topologically protected localised states in spin chains, Scientific Reports 7, 42904 (2017).
2. Marta P. Estarellas, Irene D’Amico, Timothy P. Spiller, Robust Quantum Entanglement Generation and Generation-plus-Storage Protocols with Spin Chains, Phys. Rev. A 95, 042335 (2017).
3. Kieran N. Wilkinson, Marta P. Estarellas, Timothy P. Spiller, Irene D’Amico, Rapid and Robust generation of Einstein--Podolsky--Rosen pairs with Spin Chains, Quant. Inf. Comput. Vol.18 No.3&4, 2018.

Funding Notes

Please note that for PhD projects advertised as “awaiting funding”, we anticipate that the majority of decisions will be made in December 2019

References

The work will be done in collaboration with Dr M. Estarellas (National Institute of Informatics, Tokyo), so we foresee few-month visit(s) in Japan to work closely with Dr Estarellas.

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