A chiral route to spontaneous entanglement generation

We study the generation of spontaneous entanglement between two qubits chirally coupled to a waveguide. The maximum achievable concurrence is demonstrated to increase by a factor of $4/e \sim 1.5$ as compared to the non-chiral coupling situation. The proposed entanglement scheme is shown to be robust against variation of the qubit properties such as detuning and separation, which are critical in the non-chiral case. This result relaxes the restrictive requirements of the non-chiral situation, paving the way towards a realistic implementation. Our results demonstrate the potential of chiral waveguides for quantum entanglement protocols.Comment: 5 pages + 1 page supplemental, 4 figure

The link between water access and subjective well-being: some methods and proposals.

The study of happiness or subjective well-being has traditionally been studied within the disciplines of psychology or sociology. Although economics has contemplated happiness in research terms, it has only recently been studied in any depth. In this paper we offer several proposals in order to investigate the relationship between water access and happiness, suggesting some situations that would merit further research. Moreover, we have included some methodological notes in order to achieve this objective. This relationship can be useful in two ways. Firstly, it can favour the contemplation of water access as a human right. Secondly, it can serve as a framework for the decision-making process carried out by Governments and NGOs in developing countries.

Harvesting Excitons Through Plasmonic Strong Coupling

Exciton harvesting is demonstrated in an ensemble of quantum emitters coupled to localized surface plasmons. When the interaction between emitters and the dipole mode of a metallic nanosphere reaches the strong coupling regime, the exciton conductance is greatly increased. The spatial map of the conductance matches the plasmon field intensity profile, which indicates that transport properties can be tuned by adequately tailoring the field of the plasmonic resonance. Under strong coupling, we find that pure dephasing can have detrimental or beneficial effects on the conductance, depending on the effective number of participating emitters. Finally, we show that the exciton transport in the strong coupling regime occurs on an ultrafast timescale given by the inverse Rabi splitting ($\sim10~$fs), orders of magnitude faster than transport through direct hopping between the emitters.Comment: 5 pages, 3 figure

Dificultades docentes en el estudio de forjados de madera reforzados mediante losa superior de hormigón

El refuerzo de forjados de madera mediante la conexión de una losa de hormigón superior es una técnica ampliamente utilizada en el sector de la rehabilitación de edificios antiguos. Sin embargo, la experiencia muestra que el análisis estructural de estos tipos de refuerzos se realiza en muchas ocasiones de una manera empírica, sin aportar justificaciones numéricas, sobre todo en dos cuestiones: el análisis de la resistencia de los elementos de madera y el cálculo de la conexión. El Grupo de Innovación Educativa de la Universidad Politécnica de Madrid Enseñanza del Hormigón Estructural (EHE) está desarrollando un Proyecto de Innovación Educativa (PIE) basado en la elaboración de casos prácticos. En este trabajo se estudia uno de ellos relativo al análisis de refuerzo de forjados de madera mediante la conexión de una losa superior de hormigón

Introduction to the SESAR WP-E research nerwork: HALA (Higher Automation Levels in ATM)

HALA! (Higher Automation Levels in Automation) is a SESAR WP-E Research Network inspired and underpinned by the highest principles of collaboration, transparency and innovation for the effective application of automation of the ATM processes. HALA! is ready to support and complement SESAR R&D activities in Automation, providing a Scientific Collaborative Platform through the participation by the most relevant world class universities, R&D centers and industry in AT

Present and future ecological niche modeling of garter snake species from the Trans-Mexican Volcanic Belt

Articulo producto parcial de tesis doctoralLand use and climate change are affecting the abundance and distribution of species. The Trans-Mexican Volcanic Belt (TMVB) is a very diverse region due to geological history, geographic position, and climate. It is also one of the most disturbed regions in Mexico. Reptiles are particularly sensitive to environmental changes due to their low dispersal capacity and thermal ecology. In this study, we define the important environmental variables (considering climate, topography, and land use) and potential distribution (present and future) of the five Thamnophis species present in TMVB. To do so, we used the maximum entropy modeling software (MAXENT). First, we modeled to select the most important variables to explain the distribution of each species, then we modeled again using only the most important variables and projected these models to the future considering a middle-moderate climate change scenario (rcp45), and land use and vegetation variables for the year 2050 (generated according to land use changes that occurred between years 2002 and 2011). Arid vegetation had an important negative effect on habitat suitability for all species, and minimum temperature of the coldest month was important for four of the five species. Thamnophis cyrtopsis was the species with the lowest tolerance to minimum temperatures. The maximum temperature of the warmest month was important for T. scalaris and T. cyrtopsis. Low percentages of agriculture were positive for T. eques and T. melanogaster but, at higher values, agriculture had a negative effect on habitat suitability for both species. Elevation was the most important variable to explain T. eques and T. melanogaster potential distribution while distance to Abies forests was the most important variable for T. scalaris and T. scaliger. All species had a high proportion of their potential distribution in the TMVB. However, according to our models, all Thamnophis species will experience reductions in their potential distribution in this region. T. scalaris will suffer the biggest reduction because this species is limited by high temperatures and will not be able to shift its distribution upward, as it is already present in the highest elevations of the TMVB.Universidad Autónoma del Estado de México: 4047/2016SF. CONACY

Novel Negotiation protocol to support CDM process in a layered ATM System

In the SESAR Step 2 concept of operations a RBT is available and seen by all making it possible to conceive a different operating method than the current ATM system based on Collaborative Decisions Making processes. Currently there is a need to describe in more detail the mechanisms by which actors (ATC, Network Management, Flight Crew, airports and Airline Operation Centre) will negotiate revisions to the RBT. This paper introduces a negotiation model, which uses constraint based programing applied to a mediator to facilitate negotiation process in a SWIM enabled environment. Three processes for modelling the negotiation process are explained as well a preliminary reasoning agent algorithm modelled with constraint satisfaction problem is presented. Computational capability of the model is evaluated in the conclusion

High Density en Route airspace safety level and colllision risk estimation based on stored aircraft tracks

The major constraint in developing appropriate monitoring methodologies and tools to assess the level of safety in en-route airspaces where controllers monitor air traffic by means of radar surveillance and provide aircraft with tactical instructions lies in the estimation of the operational risk. The operational risk estimate normally relies on incident reports provided by the air navigation service providers (ANSPs). The provision of incident reports is highly dependent on the safety management practices of each ANSP and requires the complete cooperation of both controllers (in identifying and reporting altitude deviations) and incident investigators (in providing operational reports to the RMA in good time). The EUROCONTROL 2009 SRC Annual Safety Report concludes that whilst "there has been an improvement in reporting of safety occurrences, overall progress towards full reporting by states is too slow." This paper presents a new and innovative approach to assessing aircraft safety level within En-route Airspaces based upon the process and analysis of radar tracks. The proposed methodology has been designed to complement the information collected in the accident and incident databases, thereby providing the following information inferred from the in depth assessment of proximate event