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Quantum Interrogation and the Safer X-Ray

Kent, Adrian; Wallace, David

HPL-2001-213

Keyword(s): quantum information; quantum interrogation; quantum imaging; low absorption imaging

Abstract: We investigate quantum interrogation techniques which allow imaging information about semi-transparent objects to be obtained with lower absorption rates than standard classical methods. We show that a gain proportional to log N can be obtained when searching for defects in an array of N pixels, if it is known that at most M of the pixels can have transparencies different from a predetermined theoretical value. A logarithmic gain can also be obtained when searching for infrequently occurring large structure in arrays. Notes: David Wallace, Centre for Quantum Computation, Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, UK

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