1,721,565 research outputs found
Data and codes for Orozco-Ruiz et al. "Quantum control without quantum states"
No full textSimulation data and analytic structure constants for the paper "Quantum control without quantum states" by Modesto Orozco-Ruiz, Nguyen Le, and Florian Mintert
Quantum control by effective counterdiabatic driving
No full textWe review a scheme for the systematic design of quantum control protocols based on shortcuts to adiabaticity in few-level quantum systems. The adiabatic dynamics is accelerated by introducing high-frequency modulations in the control Hamiltonian, which mimic a time-dependent counterdiabatic correction. We present a number of applications for the high-fidelity realization of quantum state transfers and quantum gates based on effective counterdiabatic driving, in platforms ranging from superconducting circuits to Rydberg atoms
Typical features of the Mintert-Buchleitner lower bound for concurrence
No full textDespite the great importance of quantum entanglement, a computationally practical, physically motivated,
and experimentally implementable way to estimate the amount of entanglement associated with a general
mixed state of a bipartite quantum system is still lacking. An entanglement lower bound recently advanced by
Mintert and Buchleitner Phys. Rev. Lett. 98, 140505 2007 was proposed as a possible tool for the aforementioned task. Mintert and Buchleitner presented evidence indicating that, due to its tightness, in some
important cases the alluded bound can be used as an entanglement measure. From the physical point of view,
what makes this bound particularly appealing as an entanglement measure is that it is based on an observable
quantity. For this last reason, and also because of its other attractive feature, mathematical simplicity, this
promising bound and its possible use as an entanglement estimator certainly deserve to be the focus of careful
attention. The usefulness of the bound as an entanglement measure, however, depends on its degree of tightness. Here we perform a systematic survey of the behavior of the alluded bound in state space, in order to
determine its typical properties in particular its tightness and thus assess its value as an entanglement
estimator.This work was partially supported by MEC Grant No.
FIS2008-00781 Spain, EU , by Junta de Andalucia Programs No. FQM-2445 and No. FQM-207 Spain, EU , by
FEDER EU , and by CONICET Argentine Agency . A.B.
and A.P.M. acknowledge support from MEC through FPU
Grant No. AP-2004-962 and Contract No. SB-2006-0165.Peer reviewe
Automatisierte WWW-Veröffentlichung auf der Basis formaler Auszeichnungssprachen
No full textDas Ergebnis dieser Diplomarbeit ist ein System, das SGML/XML-kodierte Dokumente für die Veröffentlichung im World Wide Web aufbereitet. Der Benutzer, d.h. der Leser, hat die Möglichkeit, nach Stichworten in einer von mehreren Kategorien zu suchen. Suchbegriff und Suchkategorie ersetzen die häufig zu ungenaue Volltextsuche. Im Gegensatz zu den Ausgaben von herkömmlichen Suchfunktionen erhält er als Ergebnis keinen vorgefertigten Ausschnitt aus dem Dokument (z.B. ein Kapitel, einen Abschnitt usw.). Vielmehr wird der Ausschnitt in Abhängigkeit der Textstelle bestimmt, die bei der Suche als Treffer ermittelt wurde. Die Definition solcher Dokumentausschnitte und der Suchkategorie findet mit Bezug auf den Dokumenttyp, nicht bezüglich des konkreten Textes statt. Diese Herangehensweise besitzt den Vorteil, notwendige Konfigurationen nur einmal je Dokumenttyp machen zu müssen, die dann für sämtliche Dokumente dieses Typs anwendbar sind. Die Arbeit ist die elektronische Version der Diplomarbeit Mintert, Stefan: Automatisierte WWW-Veröffentlichung auf der Basis formaler Auszeichnungssprachen"
The impacts of captive supplies on the fed cattle industry
No full textExpanded version of this paper later published as: Schroeder, T., Jones, R., Mintert, J., & Barkley, A. (1993). The impact of forward contracting on fed cattle transaction prices. Review of Agricultural Economics, 15(2), 325-337.Report submitted to the Research Institute on Livestock Pricing, Dept. of Agricultural Economics, Virginia Tech
Dynamical enhancement of spatial entanglement in massive particles
No full textWe discuss dynamical enhancement of entanglement in a driven Bose-Hubbard model and find an enhancement of two orders of magnitude from the ground state value which is robust against fluctuations in experimental parameters
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
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