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Publicações

Publicações por Luís Soares Barbosa

2022

Modelling and control of manufacturing systems subject to context recognition and switching

Autores
Southier, LFP; Casanova, D; Barbosa, L; Torrico, C; Barbosa, M; Teixeira, M;

Publicação
INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH

Abstract
Finite-State Automata (FSA) are foundations for modelling, synthesis, verification, and implementation of controllers for manufacturing systems. However, FSA are limited to represent emerging features in manufacturing, such as the ability to recognise and switch contexts. One option is to enrich FSA with parameters that carry details about the manufacturing, which may favour design and control. A parameter can be embedded either on transitions or states of an FSA, and each approach defines its own modelling framework, so that their comparison and integration are not straightforward, and they may lead to different control solutions, modelled, processed and implemented distinctly. In this paper, we show how to combine advantages from parameters in manufacturing the modelling and control. We initially present a background that allows to understand each parameterisation strategy. Then, we introduce a conversion method that translates a design-friendly model into a synthesis-efficient structure. Finally, we use the converted models is synthesis, highlighting their advantages. Examples are used throughout the paper to illustrate and compare our results and tooling support is also provided.

2023

Structured Specification of Paraconsistent Transition Systems

Autores
Cunha, J; Madeira, A; Barbosa, LS;

Publicação
Fundamentals of Software Engineering - 10th International Conference, FSEN 2023, Tehran, Iran, May 4-5, 2023, Revised Selected Papers

Abstract
This paper sets the basis for a compositional and structured approach to the specification of paraconsistent transitions systems, framed as an institution. The latter and theirs logics were previously introduced in [CMB22] to deal with scenarios of inconsistency in which several requirements are on stake, either reinforcing or contradicting each other. © 2023, IFIP International Federation for Information Processing.

2023

Capturing Qubit Decoherence through Paraconsistent Transition Systems

Autores
Barbosa, LS; Madeira, A;

Publicação
COMPANION PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON THE ART, SCIENCE, AND ENGINEERING OF PROGRAMMING, PROGRAMMING 2023

Abstract
This position paper builds on the authors' previous work on paraconsistent transition systems to propose a modelling framework for quantum circuits with explicit representation of decoherence.

2016

Electronic governance in Portugal

Autores
Fernandes, S; Barbosa, LS;

Publicação
Proceedings of the International Conference on Electronic Governance and Open Society Challenges in Eurasia - EGOSE '16

Abstract

2024

On Quantum Natural Policy Gradients

Autores
Sequeira, A; Santos, LP; Barbosa, LS;

Publicação
CoRR

Abstract

2024

Digital quantum simulation of non-perturbative dynamics of open systems with orthogonal polynomials

Autores
Guimaraes, JD; Vasilevskiy, MI; Barbosa, LS;

Publicação
QUANTUM

Abstract
Classical non-perturbative simulations of open quantum systems' dynamics face several scalability problems, namely, exponential scaling of the computational effort as a function of either the time length of the simulation or the size of the open system. In this work, we propose the use of the Time Evolving Density operator with Orthogonal Polynomials Algorithm (TEDOPA) on a quantum computer, which we term as Quantum TEDOPA (Q-TEDOPA), to simulate nonperturbative dynamics of open quantum systems linearly coupled to a bosonic environment (continuous phonon bath). By performing a change of basis of the Hamiltonian, the TEDOPA yields a chain of harmonic oscillators with only local nearestneighbour interactions, making this algorithm suitable for implementation on quantum devices with limited qubit connectivity such as superconducting quantum processors. We analyse in detail the implementation of the TEDOPA on a quantum device and show that exponential scalings of computational resources can potentially be avoided for time-evolution simulations of the systems considered in this work. We applied the proposed method to the simulation of the exciton transport between two light-harvesting molecules in the regime of moderate coupling strength to a non-Markovian harmonic oscillator environment on an IBMQ device. Applications of the Q-TEDOPA span problems which can not be solved by perturbation techniques belonging to different areas, such as the dynamics of quantum biological systems and strongly correlated condensed matter systems.

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