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Optical Quantum Computation with Cluster States

Professor Michael Nielsen

Federation Fellow and the Foundation Professor of Quantum Information Science, University of Queensland

3.30pm, Friday 17 September 2004, AR103 Seminar Room, Graduate Research Centre

Quantum computation offers extraordinary theoretical promise for the speedup of information processing tasks, a promise matched by the extraordinary difficulty of building large scale quantum computing devices. In this talk I describe a new approach to quantum computation using single photons. What is interesting about this approach - apart from the fact that it's the simplest optical approach to quantum computing! - is that it uses quantum measurements to simulate coherent unitary dynamics. This is in contrast to the way we usually think about quantum measurements, as destroyers of quantum coherence, and thus challenges us to rethink the way we understand such basic quantum processes as measurement and unitary evolution.

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