74 research outputs found

    Noise effect on Grover algorithm

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    The decoherence effect on Grover algorithm has been studied numerically through a noise modelled by a depolarizing channel. Two types of error are introduced characterizing the qubit time evolution and gate application, so the noise is directly related to the quantum network construction. The numerical simulation concludes an exponential damping law for the successive probability of the maxima as time increases. We have obtained an allowed-error law for the algorithm: the error threshold for the allowed noise behaves as Eth(N) ~ 1/N1.1 (N being the size of the data set). As the power of N is almost one, we consider the Grover algorithm as robust to a certain extent against decoherence. This law also provides an absolute threshold: if the free evolution error is greater than 0.043, Grover algorithm does not work for any number of qubits affected by the present error model. The improvement in the probability of success, in the case of two qubits has been illustrated by using a fault-tolerant encoding of the initial state by means of the [[7,1,3]] quantum code.Comment: Accepted to be published in Eur. Phys. J. D (2008

    Theodoretou episcopou Kyrou, peri pronoias logoi deka = Theodoreti episcopi Cyri De providentia sermones X

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    Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte. Subdirección General de Coordinación Bibliotecaria, 2013Sign.: [alpha]-[pi]8Port. con grab. xil. y con el escudo del cardenal Rodolfi, a quien está dedicada la obr

    Fabrication and mechanical testing of a new sandwich structure with carbon fiber network core

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    The aim is the fabrication and mechanical testing of sandwich structures including a new core material known as fiber network sandwich materials. As fabrication norms for such a material do not exist as such, so the primary goal is to reproduce successfully fiber network sandwich specimens. Enhanced vibration testing diagnoses the quality of the fabrication process. These sandwich materials possess low structural strength as proved by the static tests (compression, bending), but the vibration test results give high damping values, making the material suitable for vibro-acoustic applications where structural strength is of secondary importance e.g., internal panelling of a helicopter

    squarrosa

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    Grindelia squarrosa (Pursh) Dunalcurly-cup gumweedherbe à gomme communeentrance to Logan Canyon, south side on ridgeJ.F. Bainridge east of radio tower, dry N.facing slopeWyethia amplexicaulis, Packera multilobata, Packera streptanthfoli

    Carex

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    Slopes west of Bertha LakeRock and shale slopes7000 feetHer

    Solidago

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    West Castle, Southfork Lakesalpine meadow6500 feetherb; 3-7 inche

    ferruginea

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    Micranthes ferruginea (Graham) Brouillet & Gornallrusty saxifragesaxifrage à feuilles roussesKasloJoanne Goldengravel bank of trail to Sunset Lake, Kokanee Glacier Par

    acetosella

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    Rumex acetosella Linnaeussheep sorrel;redweed;red sorrel;common sheep sorrel;field sorrel;sourweedpetite oseille;oseille;rumex petite-oseille;patience petite oseille;vignette;suretteacetosellaalong Mo. #64, at the Bennett Springs junctionRoadsid

    acetosella

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    Rumex acetosella Linnaeussheep sorrel;redweed;red sorrel;common sheep sorrel;field sorrel;sourweedpetite oseille;oseille;rumex petite-oseille;patience petite oseille;vignette;suretteRumex acetosellaalong Mo.3 64, at the Bennett Springs junctionRoadsid
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