Wigner representation for polarization-momentum hyperentanglement generated in parametric down conversion, and its application to complete Bell-state measurement

We apply the Wigner function formalism to the study of two-photon polarization-momentum hyperentanglement generated in parametric down conversion. It is shown that the consideration of a higher number of degrees of freedom is directly related to the extraction of additional uncorrelated sets of zeropoint modes at the source. We present a general expression for the description of the quantum correlations corresponding to the sixteen Bell base states, in terms of four beams whose amplitudes are correlated through the stochastic properties of the zeropoint field. A detailed analysis of the two experiments on complete Bell-state measurement included in [Walborn et al., Phys. Rev. A 68, 042313 (2003)] is made, emphasizing the role of the zeropoint field. Finally, we investigate the relationship between the zeropoint inputs at the source and the analysers, and the limits on optimal Bell-state measurement.Comment: 28 pages, 4 figure

Partial Bell-state analysis with parametric down conversion in the Wigner function formalism

We apply the Wigner function formalism to partial Bell-state analysis using polarization entanglement produced in parametric down conversion. Two-photon statistics at a beam-splitter are reproduced by a wavelike description with zeropoint fluctuations of the electromagnetic field. In particular, the fermionic behaviour of two photons in the singlet state is explained from the invariance on the correlation properties of two light beams going through a balanced beam-splitter. Moreover, we show that a Bell-state measurement introduces some fundamental noise at the idle channels of the analyzers. As a consequence, the consideration of more independent sets of vacuum modes entering the crystal appears as a need for a complete Bell-state analysis

Desenvolvimento de novos materiais com propriedades biocidas para aplicação como consolidantes em Património

Estudos recentes em conservação e restauro têm visado a definição das etapas e das técnicas de intervenção no património cultural. As tendências atuais de investigação confirmam que a perda de coesão das argamassas históricas, por efeito da dissolução do ligante e/ou de destruição da estrutura porosa, é uma evidência frequente em superfícies arquitetónicas antigas. A etapa de consolidação surge como uma das principais fases de intervenção nos revestimentos históricos e, enquanto técnica de intervenção, a aplicação de consolidantes tem adquirido bastante interesse para o campo da investigação. Neste contexto, a aposta em consolidantes inorgânicos tem ganho terreno e assenta no facto de serem altamente compatíveis com os suportes e apresentarem baixo custo , o que representam vantagens quando comparados com os consolidantes de natureza orgânica. Contudo, a fraca eficácia registada no uso da água de cal e no silicato de etilo tem justificado, ao longo dos anos, o aparecimento de outras alternativas como as dispersões em álcool de nanopartículas de cal. O projeto de desenvolvimento de novos materiais com propriedades biocidas para aplicação como consolidantes em Património Cultural, realizado no Laboratório HERCULES, no âmbito do projeto de estágio da licenciatura em Biotecnologia, teve o propósito de desenvolver métodos de preparação e otimizar as condições de síntese de nanomateriais visando a sua potencial aplicação como consolidantes em substratos de argamassas de cal. O estudo que aqui se apresenta consistiu na preparação de vários tipos de materiais, nomeadamente, materiais inorgânicos, hidróxido de cálcio (Ca(OH)2), materiais híbridos preparados pelo método sol-gel a partir de alcóxidos de silício e de titânio (Si(OEt)4 e Ti(OPri)4), e materiais híbridos preparados pelo método sol-gel modificado preparados igualmente a partir dos alcóxidos de silício e titânio e usando n-octilamina como surfactante. Adicionalmente foram realizados ensaios que permitiram avaliar a eficácia dos materiais preparados como biocidas.SFRH/BPD/97692/2013 (FCT

Fertilizantes e corretivo da acidez do solo em pimenta-de-cheiro (Capsicum chinense) cultivada no Estado do Amazonas (1ª aproximação).

Clima e solo. Semeadura e plantio. Amostragem de solo. Calagem e adubação. Adubação de plantio. Adubação de manutenção. Análise foliar

JCML: A specification language for the runtime verification of Java Card programs

AbstractJava Card is a version of Java developed to run on devices with severe storage and processing restrictions. The applets that run on these devices are frequently intended for use in critical, highly distributed, mobile conditions. They are required to be portable and safe. Often, the requirements of the application impose the use of dynamic, on-card verifications, but most of the research developed to improve the safety of Java Card applets concentrates on static verification methods. This work presents a runtime verification approach based on Design by Contract to improve the safety of Java Card applications. To this end, we propose JCML (Java Card Modelling Language) a specification language derived from JML (Java Modelling Language) and its implementation: a compiler that generates runtime verification code. We also present some experiments and quality indicators. This paper extends previous published work from the authors with a more complete and precise definition of the JCML language and new experiments and results

Synthesis of novel sulfide-based cyclic peptidomimetic analogues to solonamides

Eight new sulfide-based cyclic peptidomimetic analogues of solonamides A and B have been synthesized via solid-phase peptide synthesis and SN2’ reaction on a Morita–Baylis–Hillman (MBH) residue introduced at the N-terminal of a tetrapeptide. This last step takes advantage of the electrophilic feature of the MBH residue and represents a new cyclization strategy occurring. The analogues were prepared in moderate overall yields and did not show toxic effects on Staphylococcus aureus growth and were not toxic to human fibroblasts. Two of them inhibited the hemolytic activity of S. aureus, suggesting an interfering action in the bacterial quorum sensing similar to the one already reported for solonamides.This work has been supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) - Finance Code 001, Conselho Nacional de Desen-volvimento Científico e Tecnológico – Brasil (CNPq) – J. B-V graduate fellow and L. A. M. undergraduate fellow, Fundação de Apoio à Pesquisa do Distrito Federal – Brasil 0193.001.560/ 2017, Decanato de Pesquisa e Pós-graduação (DPG-UnB). We also acknowledge Prof. Dr. Guilherme D. Brand (IQ-UnB), Prof. Dr. Carlos K. Z. Andrade (IQ-UnB), Prof. Dr. Peter Bakuzis (IQ-UnB), Departamento de Polícia Federal (SEPLAB-INC-DPF) and CAIQ-UnB

Supporting Non-functional Requirements in Services Software Development Process: An MDD Approach

International audienceThis paper presents the π-SODM method an extension to the Service Oriented Development Method (SOD-M) to support the develop- ment of services software considering their functional and non-functional requirements. Specifically, π-SODM proposes: (i) meta-models for rep- resenting non-functional requirements in different abstraction levels; (ii) model-to-model transformation rules, useful to semi-automatically re- fine Platform Independent Models into Platform Specific Models; and (iii) rules to transform Platform Specific Models into concrete imple- mentations. In order to illustrate the use of this methodology the paper describes how its use to develop a proof-of-concept

COVID-19 Vaccination Is Safe among Mast Cell Disorder Patients, under Adequate Premedication

Reported cases of anaphylaxis following COVID-19 vaccination raised concerns about the safety of these vaccines, namely in patients suffering from clonal mast cell (MC) disorders—a het-erogenous group of disorders in which patients may be prone to anaphylaxis caused by vaccination. This study aimed to assess the safety of COVID-19 vaccines in patients with clonal MC disorders. We performed an ambidirectional cohort study with 30 clonal MC disorder patients (n = 26 in the prospective arm and n = 4 in the retrospective arm), that were submitted to COVID-19 vaccination. Among these, 11 (37%) were males, and median age at vaccination date was 41 years (range: 5 y to 76 y). One patient had prior history of anaphylaxis following vaccination. Those in the prospective arm received a premedication protocol including H1-and H2-antihistamines and montelukast, while those in the retrospective arm did not premedicate. Overall, patients received a total of 81 doses, 73 under premedication and 8 without premedication. No MC activation symptoms were reported. COVID-19 vaccination seems to be safe in patients with clonal mast cell disorders, including those with prior anaphylaxis following vaccination. Robust premedication protocols may allow for vaccination in ambulatory settings. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.This research received no external funding. Article processing charges were paid by the IAPorto Research Center