Quantum process tomography of a controlled-NOT gate

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dc.creatorO'Brien, J. L.
dc.creatorPryde, G. J.
dc.creatorGilchrist, A.
dc.creatorJames, D. F. V.
dc.creatorLangford, N. K.
dc.creatorRalph, T. C.
dc.creatorWhite, A. G.
dc.date2004-02-23
dc.date2004-08-16
dc.date.accessioned2026-07-07T11:40:45Z
dc.date.available2026-07-07T11:40:45Z
dc.descriptionWe demonstrate complete characterization of a two-qubit entangling process - a linear optics controlled-NOT gate operating with coincident detection - by quantum process tomography. We use maximum-likelihood estimation to convert the experimental data into a physical process matrix. The process matrix allows accurate prediction of the operation of the gate for arbitrary input states, and calculation of gate performance measures such as the average gate fidelity, average purity and entangling capability of our gate, which are 0.90, 0.83 and 0.73, respectively.
dc.description4 pages, 2 figures. v2 contains new data corresponding to improved gate operation. Figure quality slightly reduced for arXiv
dc.identifierhttps://arxiv.org/abs/quant-ph/0402166
dc.identifierhttp://arxiv.org/abs/quant-ph/0402166
dc.identifierPhys.Rev.Lett.93:080502,2004
dc.identifierdoi:10.1103/PhysRevLett.93.080502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200351
dc.subjectQuantum Physics
dc.titleQuantum process tomography of a controlled-NOT gate
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