7,625 research outputs found
Greenberger-Horne-Zeilinger state generation with linear optical elements
We propose a scheme to probabilistically generate Greenberger-Horne-Zeilinger
(GHZ) states encoded on the path degree of freedom of three photons. These
photons are totally independent from each other, having no direct interaction
during the whole evolution of the protocol, which remarkably requires only
linear optical devices to work, and two extra ancillary photons to mediate the
correlation. The efficacy of the method, which has potential application in
distribited quantum computation and multiparty quantum communication, is
analyzed in comparison with similar proposals reported in the recent
literature. We also discuss the main error sources that limit the efficiency of
the protocol in a real experiment and some interesting aspects about the
mediator photons in connection with the concept of spatial nonlocality
Avaliação da aceitação de bebida mista contendo cajuÃna em função das proporções de seus componentes.
bitstream/item/33705/1/BP10006.pd
Core excitation in Ozone localized to one of two symmetry-equivalent chemical bonds - molecular alignment through vibronic coupling
Core excitation from terminal oxygen O in O is shown to be an
excitation from a localized core orbital to a localized valence orbital. The
valence orbital is localized to one of the two equivalent chemical bonds. We
experimentally demonstrate this with the Auger Doppler effect which is
observable when O is core-excited to the highly dissociative
O1s7a state. Auger electrons emitted from the atomic oxygen
fragment carry information about the molecular orientation relative to the
electromagnetic field vector at the moment of excitation. The data together
with analytical functions for the electron-peak profiles give clear evidence
that the preferred molecular orientation for excitation only depends on the
orientation of one bond, not on the total molecular orientation. The
localization of the valence orbital "7a" is caused by mixing of the valence
orbital "5b" through vibronic coupling of anti-symmetric stretching mode
with b-symmetry. To the best of our knowledge, it is the first discussion
of the localization of a core excitation of O. This result explains the
success of the widely used assumption of localized core excitation in
adsorbates and large molecules
Eco-Innovation Influencers: Unveiling the Role of Lean Management Principles Adoption
This study analyzes the determinant factors of eco-innovation, considering business units with dierent levels of technological intensity (high technology versus low technology). It aims, in the first instance, to complement the approach on the determinants of eco-innovation in the existent literature by incorporating the novelty related to the analysis of the eects arising from the adoption of the lean management principles. Specifically, it aims to analyze the eects of the previously referred to determinant factors both on the economic performance and on the innovative performance of Portuguese industrial and service companies with dierent levels of technological intensity (high-tech versus low-tech). The conceptual model presented is of an innovative nature, since it includes four groups of determinant factors present in the literature, namely technology, market, public policies, and cooperation relationships, and adds a fifth group of determinant factors still to be explored empirically concerning the adoption of lean management principles. In the empirical approach, five research hypotheses arising from the literature review are tested, using secondary data collected from the Community Innovation Survey (CIS)\u2014CIS 2010 for a total sample of 334 companies, made up of 95 high-tech companies and 239 low-tech companies. The conceptual model is tested using a logistic regression method, which indicated a suitable accuracy and reliability for the purposes of empirical tests. The empirical evidence confirms that most of the groups of determinants previously identified in the literature have a significant influence on eco-innovation. In addition, the empirical evidence obtained here indicates a positive and significant eect of lean management principles on eco-innovation
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