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Universal quantum computation on the power of quantum non-demolition measurements

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arxiv quant-ph/0507232 v2 pith:2FGJJ7JA submitted 2005-07-24 quant-ph

classification quant-ph
keywords quantumcomputationlinearmeasurementsnon-demolitionopticaluniversalallowed
verification ladder T0 review T1 audit T2 compute T3 formal
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In this paper we investigate the linear and nonlinear models of optical quantum computation and discuss their scalability and efficiency. We show how there are significantly different scaling properties in single photon computation when weak cross-Kerr nonlinearities are allowed to supplement the usual linear optical set. In particular we show how quantum non-demolition measurements are an efficient resource for universal quantum computation.

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