1,720,982 research outputs found
Fuzzy approach for C-NOT gate in quantum computation with mixed states
No full textIn the framework of quantum computation with mixed states, a fuzzy representation of CNOT gate is introduced. In this representation, the incidence of non-factorizability is specially investigated
Binary gates in three valued quantum computational logics
No full textThe standard theory of quantum computation relies on the idea that the qubit – the basic information quantity – is represented by a superposition of
elements of the standard quantum computational basis B(2) = {|0i, |1i}. In the present paper we focus on the case of qutrits where the standard quantum computational bases is replaced by a three-valued computational basis B(3) = {|0i, | 1 2 i, |1i}. Recently in, unary gates on the Hilbert space C3 were considered. In this work we propose an extensive method that allows to extend binary gates to the framework of qutrits
On when a semantics is not a good semantics: The algebraisation of orthomodular logic
No full textIt has been taken for granted for a long time that orthomodular lattices are the "algebraic counterpart" of orthomodular quantum logic. Pavicic and Megill have questioned this claim by pointing out that orthomodular quantum logic is sound and complete with respect to a proper supervariety of the variety OML of orthomodular lattices (the so-called weakly orthomodular lattices). The same authors conclude that "in the syntactical structure of quantum logic there is nothing orthomodular". After reviewing in a certain detail some concepts from Abstract Algebraic Logic, especially Blok and Pigozzi's theory of algebraisable logics, we argue that the weakly orthomodular semantics introduced by Pavicic and Megill is not a good semantics, and that the role of OML as an algebraic counterpart of quantum logic is unaected by their allegations
Representing fuzzy structures in quantum computation with mixed states
No full textIn this work we introduce a particular kind of quantum operations called polynomial quantum operations that allow us to represent the basic operations of the standard Product MV -algebra. Consequently, these operations can be treated as quantum computational gates in the powerful model of quantum computation given by “quantum operations - density operators”
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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