School of Physics - Theses

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Quantum information engineering: concepts to quantum technologies

Devitt, Simon ( 2007-11)

This thesis investigates several broad areas related to the eﬀective implementation of quantum information processing, from large scale quantum algorithms and error correction, through to system identiﬁcation and characterization techniques, eﬃcient designs for quantum computing architectures and the design of small devices which utilize quantum eﬀects. The discussion begins with the introduction of a quantum circuit appropriate for implementing Shor’s factoring algorithm on Linear Nearest Neighbor qubit arrays such as the Kane phosphorus in silicon system. Detailed numerical sim- ulations are then presented, demonstrating the sensitivity of the circuit under coherent quantum errors. The concepts of Quantum Error Correction and Fault-tolerant computation are reviewed with original work carried out to show the relative robustness and practicality of Fault-tolerant computation for logical state preparation. Methods of intrinsic system identiﬁcation and characterization are proposed. Protocols for characterizing both the conﬁnement of a multi-level system to the qubit subspace and the Hamiltonian dynamics governing two-qubit interactions are presented as well as a brief review of characterization techniques already developed for single qubit dynamics. (For complete abstract open document)