69 research outputs found

    Controllability and universal three-qubit quantum computation with trapped electron states

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    We show how to control and perform universal three-qubit quantum computation with trapped electron quantum states. The three qubits are the electron spin, and the first two quantum states of the cyclotron and axial harmonic oscillators. We explicitly show how the universal gates can be performed. As an example of a non-trivial quantum algorithm, we outline the implementation of the Deutsch-Jozsa algorithm in this system.Comment: 4 pages, 1 figure. Typos corrected. The original publication is available at http://www.springerlink.co

    Surfactant components of marine organic matter as agents forbiogeochemical fractionation and pollutant transport via marineaerosols

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    This study was partially supported by the CNR– ENEL Project, ‘Interaction of Energy System with Human Health and Environment’ and MURST 40% Physics Section. Many thanks to the Director of the Inter University Centre of Marine Biology and of the Municipal Aquarium of Leghorn for their hospitality and logistic assistance

    ¿“Nos enfrentamos y nos abrazamos”? Un nuevo recorrido por los usos oficiales del pasado durante el bicentenario de la Revolución de Mayo

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    El presente trabajo analiza, en primer lugar, los modos en que la historia argentina se tradujo, durante los festejos oficiales del bicentenario de la Revolución de Mayo, en artefactos culturales y festivos dirigidos a atraer un público vasto, prestando especial atención a los usos del pasado allí exhibidos. En segundo lugar, pone en relación dichas operaciones con las variaciones ocurridas en el nivel de las prácticas políticas gubernamentales tras la crisis política de 2008. En última instancia, se plantea que el gobierno de Cristina Fernández de Kirchner se inclinó, al momento de proyectar el festejo patrio en cuestión, por una lógica discursiva liberal–centrada, especialmente, en el consenso inclusivo y la aceptación de las diferencias–con el fin de matizar la partición del espacio socio-político, exhibir una nación reconciliada, interpelar a la sociedad argentina en su conjunto y, de ese modo, contribuir a la reconstrucción de su hegemonía política.Firstly, this paper analyzes how Argentinian history was translated, during the national celebrations of the May Revolution bicentennial, into cultural and festive devices aimed at attracting a massive audience, paying special attention to the uses of the past displayed. Secondly, it illustrates the relations between these operations and the variations of government policy that occurred after the 2008 political crisis. Ultimately, it claims that the Cristina Fernández de Kirchner administration adopted, when it came to planning this national holiday, a liberal discursive logic – mainly characterized by inclusive consensus and pluralism – in order to ease the division of the social and political space, display a reconciled nation, address the entire Argentinean society and, thereby, contribute to the reconstruction of Kirchnerist hegemony.Fil: Amorebieta y Vera, María Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Humanidades y Ciencias Sociales. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales; Argentin

    n-Alkanes, PAHs and surfactants in the sea surface microlayer and sea water samples of the Gerlache Inlet sea (Antarctica)

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    Sea surface microlayer (SML) and sea water samples (SSW) collected in the Gerlache Inlet Sea (Antarctica) were analysed for n-alkanes and polycyclic aromatic hydrocarbons (PAHs). The SML is a potential enrichment site of hydrophobic organic compounds compared to the underlying water column. Total concentration ranges of n-alkanes and PAHs (dissolved and particulate) in subsurface water (−0.5 m depth) were 272– 553 ng l−1 (mean: 448 ng l−1) and 5.27–9.43 ng l−1 (mean: 7.06 ng l−1), respectively. In the SML, the concentration ranges of n-alkanes and PAHs were 353–968 ng l−1 (mean: 611 ng l−1) and 7.32–23.94 ng l−1 (mean: 13.22 ng l−1), respectively. To evaluate possible PAH contamination sources, specific PAH ratios were calculated. The ratios reflected a predominant petrogenic input. A characterisation of surface active substances was also performed on SML and SSW samples, both by gas bubble extraction, and by dynamic surface tension measurements. Results showed a good correlation between n-alkanes, PAHs and refractory organic matter

    PCBs and PAHs in sea-surface microlayer and sub-surfacewater samples of the Venice Lagoon (Italy)

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    Polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) are two classes of micropollutants intensively monitored and regulated due to their toxicity, persistency and wide diffusion. Their concentrations have been investigated in sea-microlayer (SML) and sub-surface water (SSW) samples collected at two sites of the Venice Lagoon, a fragile ecosystem highly influenced by industrial and anthropogenic emissions. The total PPCB concentration varies from 0.45 ng/l to 2.1 ng/l in SSW while a clear enrichment is observed in the SML, where it ranges from 1.2 ng/l to 10.5 ng/l. The total PPAH concentration shows marked differences between the two stations and varies from 12.4 ng/l to 266.8 ng/l in SSW; in SML it is more uniform and ranges from 19.6 ng/l to 178.9 ng/l. The enrichment factors are not larger than 1 for both pollutants in the dissolved phase, while they are most significant for the particulate phase (PPCB: 5–9; PPAH: 4–14). 2005 Elsevier Ltd. All rights reserved

    α\alpha-event Characterization and Rejection in Point-Contact HPGe Detectors

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    P-type point contact (PPC) HPGe detectors are a leading technology for rare event searches due to their excellent energy resolution, low thresholds, and multi-site event rejection capabilities. We have characterized a PPC detector's response to α\alpha particles incident on the sensitive passivated and p+ surfaces, a previously poorly-understood source of background. The detector studied is identical to those in the MAJORANA DEMONSTRATOR experiment, a search for neutrinoless double-beta decay (0νββ0\nu\beta\beta) in 76^{76}Ge. α\alpha decays on most of the passivated surface exhibit significant energy loss due to charge trapping, with waveforms exhibiting a delayed charge recovery (DCR) signature caused by the slow collection of a fraction of the trapped charge. The DCR is found to be complementary to existing methods of α\alpha identification, reliably identifying α\alpha background events on the passivated surface of the detector. We demonstrate effective rejection of all surface α\alpha events (to within statistical uncertainty) with a loss of only 0.2% of bulk events by combining the DCR discriminator with previously-used methods. The DCR discriminator has been used to reduce the background rate in the 0νββ0\nu\beta\beta region of interest window by an order of magnitude in the MAJORANA DEMONSTRATOR, and will be used in the upcoming LEGEND-200 experiment.Comment: Submitted to European Journal of Physics
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