Universal and deterministic manipulation of the quantum state of harmonic oscillators: a route to unitary gates for Fock State qubits

We present a simple quantum circuit that allows for the universal and deterministic manipulation of the quantum state of confined harmonic oscillators. The scheme is based on the selective interactions of the referred oscillator with an auxiliary three-level system and a classical external driving source, and enables any unitary operations on Fock states, two-by-two. One circuit is equivalent to a single qubit unitary logical gate on Fock states qubits. Sequences of similar protocols allow for complete, deterministic and state-independent manipulation of the harmonic oscillator quantum state.Comment: 4 pages, 4 figure

Abrupt Changes in the Dynamics of Quantum Disentanglement

Entanglement evolution in high dimensional bipartite systems under dissipation is studied. Discontinuities for the time derivative of the lower bound of entanglement of formation is found depending on the initial conditions for entangled states. This abrupt changes along the evolution appears as precursors of entanglement sudden death.Comment: 4 pages and 6 figures, submitted for publicatio

Estudo da FAPAR em regiões fitoecológicas brasileiras através de série temporal derivada do NDVI/AVHRR.

The objective of this work is to study the behavior of Brazilian vegetation throughout time series of Fraction of Photosynthetically Active Radiation (FAPAR) absorbed by a plant canopy derived from vegetation index of the A VHRR sensor; observing the variations of the types of vegetation, influences and relationships with the cIimate. The F AP AR dataset has spatial resolution of 0.1 °xO.1 o and temporal resolution of 10 days for the period 1982 to 1999. The data were investigated considering the seasonal and interannual variations for phytoecological regions of the country. The FAPAR results show: the largest values were observed in Evergreen Broadleaf Forests (Dense and Open) and Campinarana, the lesser amplitude of variation of FAPAR occur in Savanna and Savanna-Steppe, due to adaptation to environmental changes. Analyses of F AP AR demonstrate that ecosystems with ali strata and structured soil have higher values. Even though, the preliminary results confirm that exists evidences ofrelation between the behavior of the FAPAR and weather conditions. The ENSO events have influence on interannual variations of FAPAR, mainly in the North and Northeast. Furthermore, the discussion presents that the FAPAR has potential to be used as an indicator of the photosynthetic process and consequently in the monitoring ofprimary production

Controlling the dynamics of a coupled atom-cavity system by pure dephasing : basics and potential applications in nanophotonics

The influence of pure dephasing on the dynamics of the coupling between a two-level atom and a cavity mode is systematically addressed. We have derived an effective atom-cavity coupling rate that is shown to be a key parameter in the physics of the problem, allowing to generalize the known expression for the Purcell factor to the case of broad emitters, and to define strategies to optimize the performances of broad emitters-based single photon sources. Moreover, pure dephasing is shown to be able to restore lasing in presence of detuning, a further demonstration that decoherence can be seen as a fundamental resource in solid-state cavity quantum electrodynamics, offering appealing perspectives in the context of advanced nano-photonic devices.Comment: 10 pages, 7 figure

Crescimento inicial de milho em solo adubado com diferentes compostos orgânicos.

Foram elaborados cinco compostos orgânicos com diferentes composições, todos a base de esterco caprino, bagaço de coco e capim elefante, enriquecidos com torta de mamona, fosfato natural de gafsa e sulfato de potássio, de modo que, a final, cada pilha tivesse concentrações diferenciadas de nutrientes. O experimento foi montado em vasos contendo solo e os compostos preparados, dispostos em delineamento experimental inteiramente casualisado,, com seis tratamentos, sendo uma testemunha, e quatro repetições. Aos 28 dias após o plantio foi efetuado o corte das plantas, avaliando-se o número de folhas, a altura das plantas, o diâmetro do colo e o peso de matéria seca. De um modo geral, os compostos promoveram maior crescimento das plantas de milho que a testemunha (sem composto) com destaque para o composto de número 22 (77% de bagaço de coco, 20% de esterco caprino e 3% de sulfato de potássio)

Minimized phytotoxic effects of pre-harvest desiccation with glyphosate in soybean seeds.

ABSTRACT: Pre-harvest desiccation of soybean plants from non-genetically modified cultivars with glyphosate have shown to be detrimental to seed physiological quality by reducing germination and increasing production of abnormal seedlings. On the other hand, many products have been applied to seeds in order to enhance quality such as growth regulators and micronutrients. This study aimed to verify the phytotoxic effects of pre-harvest desiccation with glyphosate on physiological quality of soybean seeds and if they can be overcome or minimized by the application of micronutrients and biostimulant. Seeds from soybean cultivar Conquista were produced with and without desiccation with glyphosate, at the dose 2.0 L ha?1, applied at physiological maturity stage. Right after harvest, seeds were treated with Co + Mo + B + Zn, Co + Mo and biostimulant; a control, with no treatment, was also evaluated. Physiological quality was assessed by tests of germination and seedling development. Data was submitted to variance analysis. Means were compared by the Tukey test (p ≤ 0.05) and analyzed as a 2 × 3 factorial. Dunnet?s test (p ≤ 0.05) was also applied. Negative effects of pre-harvest desiccation with glyphosate on germination of soybean seeds can be overcome by the application of micronutrients Co+Mo. Applying biostimulant to soybean seeds improves seedling development compared with micronutrient treatments, although it does not minimize detrimental effects of desiccation with glyphosate. RESUMO: A dessecação em pré-colheita de plantas de soja de cultivares tradicionais com glyphosate tem-se revelado prejudicial à qualidade fisiológica das sementes, em razão da redução da germinação e do aumento no número de plântulas anormais. Por outro lado, muitos produtos, como reguladores vegetais e micronutrientes, têm sido aplicados às sementes com o objetivo de melhorar sua qualidade. Este estudo objetivou verificar se efeitos fitotóxicos da dessecação em pré-colheita com glyphosate na qualidade fisiológica de sementes de soja podem ser superados ou minimizados pela aplicação de micronutrientes e biostimulante. Sementes de soja da cultivar Conquista foram produzidas com e sem dessecação das plantas com glyphosate, na dose de 2,0 L ha, aplicada na maturidade fisiológica. Logo após a colheita, as sementes foram tratadas com os complexos Co + Mo + B + Zn, Co + Mo e um biostimulante; a testemunha, sem tratamento, também foi avaliada. A qualidade fisiológica foi avaliada por testes de germinação e desenvolvimento de plântulas. Os dados foram submetidos à análise de variância. As médias foram comparadas pelo teste de Tukey (p ≤ 0,05) e analisadas em esquema fatorial 2 × 3. O teste de Dunnet (p ≤ 0,05) também foi aplicado. Os efeitos negativos da dessecação em pré-colheita com glyphosate na germinação das sementes de soja podem ser minimizados com a aplicação de Co + Mo. A aplicação de biostimulante às sementes de soja melhora o desenvolvimento das plântulas, quando comparada com o tratamento com micronutrientes, apesar de não minimizar os efeitos deletérios da dessecação com glyphosate