Novo encontro do COLMEA reúne debates sobre dinâmica complexa e tecnologias quânticas

O Colóquio Interinstitucional Modelos Estocásticos e Aplicações (COLMEA), que congrega vários grupos do Rio de Janeiro, dá continuidade às suas atividades em encontro no dia 28/05, às 14h, no auditório do 6° andar do Centro Brasileiro de Pesquisas Físicas (CBPF). O evento contará com as palestras de Daniel Stariolo, da Universidade Federal Fluminense (UFF), e Daniel Valente, do CBPF. Confira, abaixo, títulos, resumos e horários. 

Programação

14h / 15h – Daniel Stariolo (UFF)

Dynamics of disordered systems with non-reciprocal Interactions

Many body systems with non-reciprocal, asymmetric or non-hermitian interactions have been studied for a long time, both in classical and quantum contexts. Non-reciprocity is particularly relevant in complex, nonequilibrium systems, leading to dynamics beyond the relaxation paradigm of equilibrium, with the emergence of oscillations and even chaotic dynamics. Examples of complex systems where non-reciprocity is relevant include neural networks, ecosystems and epidemic spreading. In this talk I will discuss the dynamics of a simple model with non-reciprocal and disordered interactions, in which the degree of non-reciprocity can be tuned between the two extremes of completely symmetric and completely anti-symmetric interactions. We will see that well known characteristics of disordered systems, like slow dynamics, aging and memory, can be destroyed by an arbitrary amount of asymmetry. Moreover, above a certain threshold, non-reciprocity may induce oscillatory behavior of correlations and responses which may lead to chaotic dynamics.

15h20 / 16h20 – Daniel Valente (CBPF)

The Brownian motion paradigm revisited: from the origin of life to quantum technologies

The random motion of pollen grains in water was initially mistaken for a "vital” force, and lately understood as the consequence of the atomic nature of the fluid. In this talk, I revisit the Brownian motion paradigm (after botanist Robert Brown) to show how its modern extensions and generalizations still guide us to understand nonequilibrium physics. Ironically, both "vital" and "atomic" concepts are back in the game, but stronger, as we discuss: Thermal gradients in the environment lead to thermophoresis of Brownian particles, which provide a key mechanism to the emergence of biological structures, as shown by Dieter Braun and colleagues; and the quantum Brownian particle theory, also known as the Caldeira-Leggett model, explains macroscopic quantum phenomena in the superconducting circuits currently used in quantum computers. I conclude my talk by showing that Brownian motion can be both quantum and thermophoretic. Our results suggest a thermophoretic route for quantum information processing within current technology.

16h40 / 17h30 – Discussão e lanche

Serviço:

Encontro COLMEA

Data: 28/05 (quinta-feira)

Horário: 14h às17h30

Saiba mais sobre o COLMEA: https://www.im.ufrj.br/coloquiomea/