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Universal Quantum Computation with Continuous-Variable Cluster States

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arxiv quant-ph/0605198 v1 pith:4YGUH3ZA submitted 2006-05-23 quant-ph

Universal Quantum Computation with Continuous-Variable Cluster States

classification quant-ph
keywords clustercomputationgaussianquantumcontinuous-variabledetectionhomodynestate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We describe a generalization of the cluster-state model of quantum computation to continuous-variable systems, along with a proposal for an optical implementation using squeezed-light sources, linear optics, and homodyne detection. For universal quantum computation, a nonlinear element is required. This can be satisfied by adding to the toolbox any single-mode non-Gaussian measurement, while the initial cluster state itself remains Gaussian. Homodyne detection alone suffices to perform an arbitrary multi-mode Gaussian transformation via the cluster state. We also propose an experiment to demonstrate cluster-based error reduction when implementing Gaussian operations.

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