DEPARTAMENTO SISTEMAS COMPLEJOS Y ALTAS ENERGÍAS

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https://nuclea.cnea.gob.ar/handle/20.500.12553/5208

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Examinando DEPARTAMENTO SISTEMAS COMPLEJOS Y ALTAS ENERGÍAS por Autor "Budini, Adrián Adolfo"

Mostrando 1 - 3 de 3
  • Miniatura
    ÍtemAcceso Abierto
    Detection of quantum non-Markovianity close to the Born-Markov approximation
    (American Physical Society, 2020) de Lima Silva, Thais; Walborn, Stephen P.; Santos, Marcelo F.; Aguilar, Gabriel H.; Budini, Adrián Adolfo
    We calculate in an exact way the conditional past-future correlation for the decay dynamics of a two-level system in a bosonic bath. Different measurement processes are considered. In contrast to quantum memory measures based solely on system propagator properties, here memory effects are related to a convolution structure involving two system propagators and the environment correlation. This structure allows one to detect memory effects even close to the validity of the Born-Markov approximation. An alternative operational-based definition of environment-to-system backflow of information follows from this result. We provide experimental support to our results by implementing the dynamics and measurements in a photonic experiment.
  • Miniatura
    ÍtemAcceso Abierto
    Emergence of stationary multimodality under two-timescaled dichotomic noise
    (American Physical Society, 2020) Budini, Adrián Adolfo; McHardy, Isaias; Caceres, Manuel Osvaldo; Nizama, Marco
    We study a linear Langevin dynamics driven by an additive non-Markovian symmetrical dichotomic noise. It is shown that when the statistics of the time intervals between noise transitions is characterized by two well differentiated timescales, the stationary distribution may develop multimodality (bi- and trimodality). The underlying effects that lead to a probability concentration in different points include intermittence and also a dynamical locking of realizations. Our results are supported by numerical simulations as well as by an exact treatment obtained from a Markovian embedding of the full dynamics, which leads to a third-order differential equation for the stationary distribution.
  • Miniatura
    ÍtemAcceso Abierto
    Perturbation theory for operational quantum non-Markovianity
    (Taylor & Francis, 2020) Bonifacio, Mariano; Budini, Adrián Adolfo
    The definition of memory in operational approaches to quantum non-Markovianity depends on the statistical properties of different sets of outcomes related to successive measurement processes performed over the system of interest. Using projector techniques we develop a perturbation theory that enable to expressing both joint probabilities and outcome correlations in terms of the unperturbed system density-matrix propagator. This object defines the open system dynamics in the absence of measurement processes. Successive series terms, which are scaled by the system-environment interaction strength, consist in a convolution structure involving system propagators weighted by higher-order bath correlations. The formalism is corroborated by studying different dynamics that admit an exact description. Using the perturbative approach, unusual memory effects induced by the interplay between the system-environment interaction and measurement processes are found in finite temperature reservoirs.