Coherent Control of Quantum Dynamics with Sequences of Unitary Phase-Kick Pulses

Coherent optical control schemes exploit the coherence of laser pulses to change the phases of interfering dynamical pathways in order to manipulate dynamical processes. These active control methods are closely related to dynamical decoupling techniques, popularized in the field of Quantum Information. Inspired by Nuclear Magnetic Resonance (NMR) spectroscopy, dynamical decoupling methods apply sequences of unitary operations to modify the interference phenomena responsible for the system dynamics thus also belonging to the general class of coherent control techniques. Here we review related developments in the fields of coherent optical control and dynamical decoupling, with emphasis on control of tunneling and decoherence in general model systems. Considering recent experimental breakthroughs in the demonstration of active control of a variety of systems, we anticipate that the reviewed coherent control scenarios and dynamical decoupling methods should raise significant experimental interest.Comment: 52 pages, 7 figure

Statistics of Heat Transfer in Mesoscopic Circuits

A method to calculate the statistics of energy exchange between quantum systems is presented. The generating function of this statistics is expressed through a Keldysh path integral. The method is first applied to the problem of heat dissipation from a biased mesoscopic conductor into the adjacent reservoirs. We then consider energy dissipation in an electrical circuit around a mesoscopic conductor. We derive the conditions under which measurements of the fluctuations of heat dissipation can be used to investigate higher order cumulants of the charge counting statistics of a mesoscopic conductor.Comment: 9 pages, 6 figure

Monitoramento por radiotelemetria da área de uso de onça parda reintroduzida no entorno do Parque Estadual da Serra do Brigadeiro - MG, Brasil Radiotelemetry monitoring of the home range of cougar reintroduced at the surroundings of the State Park of Serra do Brigadeiro - MG, Brazil

Um exemplar macho, subadulto de onça parda reintroduzido foi monitorado por técnica de radiotelemetria. O monitoramento foi de 110 dias, realizado de forma aleatória, com intervalos descontínuos. Os dados do acompanhamento sugerem que a área utilizada por este espécime seja de, aproximadamente, 26km². Esta configura o menor índice já descrito para a espécie, porém, deve-se ressaltar a importância deste monitoramento básico, visto a incipiência do comportamento de um felino de grande porte reintroduzido em habitat natural após período em cativeiro.<br>One subadult male specimen of a reintroduced mountain lion was monitored using the radio telemetry technique. The monitoring lasted 110 days, being randomly distributed. Data of the monitoring through radiotelemetry suggested that the home range of this specimen was of approximately 26km². This sets as the smallest home range described for this species. However, the importance of this basic monitoring should be emphasized, since information of the behavior of a large feline reintroduced in its natural habitat after a period in captivity is incipient