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In ensemble (or bulk) quantum computation, all computations are performed on an ensemble of computers rather than on a single computer. Measurements of qubits in an individual computer cannot be performed; instead, only expectation values (over the complete ensemble of computers) can be measured. As a result of this limitation on the model of computation, many algorithms cannot be processed directly on such computers, and must be modified. We provide modification of the fault tolerant quantum computation protocols to enable processing on ensemble quantum computers.
Date of Conference: 28 June-1 July 2004