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

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

Phase-field fracture models for elastomers

The primary objective of this work is to examine, present, and suggest phase-field damage models that are suitable for simulating the fracture behavior of soft materials, with a specific focus on rubbers. To achieve this, it is essential to comprehend the various ways in which fracture occurs in rubbers through different case studies, such as simple tension tests or tests with pre-etched specimens subjected to quasi-static loading conditions. Along with the specimen shape and testing mode, it is crucial to understand how the material’s viscosity influences the rate and mode of fracture and the propagation of fracture. Next, this study will concentrate on three specific phenomena, aiming to replicate them numerically using the proposed models. To illustrate brittle fracture phenomena, the experiments detailed in Hocine et al. [2002], investigating the behavior of pre-incised specimens, will be replicated. The investigation into cohesive fracture phenomena will draw from the findings in Millereau et al. [2018], which explored double network elastomers and their pseudo ductility. Finally, the examination of dynamic fracture behavior will reference experiments from Corre et al. [2020], emphasizing the pivotal role of fracture propagation. After analyzing the experimental data, it will be necessary to introduce finite elastic and viscoelastic models for soft materials, like rubber, hydrogels, biological tissues and others that are able to undergo significant deformations (even up to 700%) under low stresses. Additionally, phase-field models of damage will be incorporated. The existing literature on finite elasticity models will be explored, including well-known models summarized in Dal et al. [2021], as well as less known models such as the one proposed by Lopez-Pamies [2010], which will also be utilized in the proposed models. The utilization of these models will contribute to formulating a Maxwell rheological scheme, as outlined in Reese and Govindjee [1998], Holzapfel [1996], and Kumar and Lopez-Pamies [2016], in order to depict viscoelastic characteristics. Subsequently, a damage state variable will be introduced to create a viscoelastic phase field model. In these phase-field models, the material’s characteristics, affecting its elastic parameters, are represented by fields of state variables. In the case of damage models, the state variable considered is damage, which progressively degrades the material parameters until failure. A literature review of damage models, including the works of Pham et al. [2011], Lancioni and Corinaldesi [2018], Wu [2017], and others, will also be conducted. Following the introduction and literature review, an elastic rate independent model capable of reproducing both brittle (Hocine et al. [2002]) and pseudo-ductile (Millereau et al. [2018]) behaviors, by incorporating a cohesive damage model into the Ogden’s (Ogden [2003]) finite elastic model will be proposed. By this way, an interpretation of failure phenomena at large damage displacements will be proposed. This model will be thoroughly explained from theoretical and numerical perspectives, elucidating the role of different constitutive parameters. In this scenario, three parameters within the degra- dation function (representing the impact of damage on the material’s elastic moduli) will hold significant importance. These parameters will respectively define the fracture’s onset, the progression during the initial post-elastic phase, and the material’s behavior at the point of complete failure. Numerical simulations will be performed to replicate the actual behavior observed in experimental tests. The model’s potential and limitations, particularly the absence of viscosity, will be analyzed and discussed. To address the influence of viscosity on fracture propagation and failure modes, a second rate-dependent formulation will be proposed, utilizing a generalized Maxwellrheological model similar to the works of Reese and Govindjee [1998] and Kumar and Lopez-Pamies [2016]. In this theory, a damage model representing brittle fracture will be considered. In this formulation, a parameter will be introduced to assess the energy dissipation resulting from the rate of damage and, thus, associated with crack propagation, as Loew et al. [2019], Levitas et al. [2010], Hakim and Karma [2009]. This parameter will serve as a characteristic time of the damage variable and it plays a crucial role in reproducing experiments of Corre et al. [2020]. This damage characteristic time will interact with the material characteristic time, which is the ratio between the viscous parameter and the stiffness. The complete model, along with the interpretation of constituent parameters, will be presented. Furthermore, considering the extreme scenarios of infinite and infinitesimal material characteristic times, pertaining to the damage characteristic time, as well as finite viscosity, will be investigated to understand their effects. The rate dependence will enable the study of loading rate influence on rupture and crack propagation in soft materials. The model will be properly calibrate to reproduce the behavior of Corre’s material, to replicate crack propagation findings. Finite element modeling will be employed to examine the material’s state around the fracture tip in terms of energies involved, dissipations, and stresses, observing the local response to crack formation. Subsequently, these two models will be analyzed to highlight their strengths and weaknesses regarding their ability to reproduce experimental results and their numerical complexities. The conclusions will summarize the potential of the presented models, the applicability of phase-field damage models to finite viscoelasticity, and the limitations of the proposed approaches. Future developments will be suggested, considering the limitations discussed and taking into account existing models in the literature

ADC Nonlinearity Correction for the Majorana Demonstrator

Imperfections in analog-to-digital conversion (ADC) cannot be ignored when signal digitization requirements demand both wide dynamic range and high resolution, as is the case for the Majorana Demonstrator 76Ge neutrinoless double-beta decay search. Enabling the experiment's high-resolution spectral analysis and efficient pulse shape discrimination required careful measurement and correction of ADC nonlinearities. A simple measurement protocol was developed that did not require sophisticated equipment or lengthy data-taking campaigns. A slope-dependent hysteresis was observed and characterized. A correction applied to digitized waveforms prior to signal processing reduced the differential and integral nonlinearities by an order of magnitude, eliminating these as dominant contributions to the systematic energy uncertainty at the double-beta decay Q value

Los asuntos públicos, el retorno de las relaciones públicas a su función política de origen

Desde este lugar estamos en condiciones de afirmar que el sector de las relaciones gubernamentales en las organizaciones requiere cada vez más la asesoría de experimentados profesionales de relaciones públicas, convirtiendo estos espacios de aparición en un desafío actual para los mismos.&nbsp

Sviluppo di una dashboard per digital twins con webxr

In questa tesi ci si pone l'obbiettivo di sviluppare una Dashboard in Realtà Estesa disponibile sul Web (con l'uso di WebXR) che permetta di gestire dei Digital Twins. Vengono forniti il significato di Realtà Estesa, Digital Twins e viene anche spiegato il potenziale della loro unione. In seguito è presente una spiegazione delle tecnologie usate per realizzare la Dashboard e infine è presente la descrizione del progetto (analisi dei requisiti, descrizione dell'architettura e implementazione) e le considerazioni su quello che si è fatto e su come potrà evolversi in futuro tale progetto

Sleep and memory: sleep’s effect on the creation of false memories

openL'elaborato si pone come obbiettivo di far chiarezza, tramite l'analisi dei dati di una ricerca sperimentale, sul ruolo del sonno nella creazione di false memorie, prendendo anche in considerazioni l'effetto della valenza emotiva degli stimoli sui ricordi. Il metodo usato include un test di riconoscimento Sì/No e si avvale dell'uso di un caschetto EEG portatile

Las relaciones públicas y la formación en valores

Los albores de las Relaciones Públicas en la Argentina han estado signados por una impronta práctica y profesional, lo que determinó un derrotero diferente del que tuvieron otras áreas de la comunicación. En efecto, su discusión teórica ha sido exigua en los ámbitos académicos locales. El estado de la cuestión respecto de la reflexión conceptual acerca de su naturaleza, su objeto, metodología y objetivos ha quedado, a nuestro juicio, “encorsetado” por el paradigma dominante, centrado en una perspectiva funcionalista y sistémica que ofrece, según aduciremos, una mirada restrictiva y, más aún reduccionista, acerca de qué implica “relacionarnos públicamente”. Este estado del arte se ha gestado, según argumentaremos, a partir de un férreo compromiso con la célebre dicotomía entre hechos y valores. El presente trabajo monográfico de investigación se propone ofrecer una elaboración crítica que (i) dé cuenta de una posible (y necesaria) resignificación de las Relaciones Públicas y (ii) que abra un horizonte conceptual novedoso para explorar el modo en que ello trasunta a la hora de reorientar su enseñanza en el ámbito de la educación superior.Fil: Stortini, Gabriel. Universidad Nacional de La Matanza; Argentina