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Para celebrar o ano Internacional da Ciência e Tecnologia Quântica, dois eventos tradicionais no Brasil, o Workshop-Escola de Computação e Informação Quântica (WECIQ) e o Workshop de Computação Quântica - UFSC (WCQ), se unem em uma edição especial, dando origem ao VIII <WECIQ|WCQ>: VIII Workshop-Escola de Computação e Informação Quântica e VIII Workshop de Computação Quântica.

Público-Alvo

O público alvo é formado por pesquisadores, professores, estudantes de graduação e pós-graduação, profissionais e entusiastas interessados nos avanços das ciência e tecnologias quânticas, as quais englobam as áreas temáticas de Computação Quântica, Comunicação Quântica, Informação Quântica, e Metrologia e Sensoriamento Quântico.

Objetivos Principais

O evento tem como objetivos principais:

1. Incrementar o desenvolvimento da informação quântica, computação quântica, comunicação quântica, e metrologia e sensoriamento quântico no Brasil;
2. Ampliar o intercâmbio de informações e ideias entre professores, pesquisadores, estudantes e profissionais destas áreas;
3. Promover a integração entre universidades, centros de pesquisas e empresas;
4. Divulgar a produção técnico-científica nacional nessas áreas;
5. Prover minicursos para a atualização de estudantes, docentes, pesquisadores, profissionais e público não especializado.

Desenvolvimento e Metodologia

Para cumprir esses objetivos, a comissão organizadora procurou promover espaços de apresentação de trabalhos; plenárias e palestras convidadas com pesquisadores de ampla experiência nacional e internacional; mesa-redonda com profissionais da indústria especializada e minicursos específicos sobre a temática do evento, todos com tempo para discussão e debate. O evento ainda contou com uma exposição de realidade virtual empregada para o ensino da Física Quântica, em que os participantes puderam utilizar óculos de realidade virtual para se colocarem dentro do átomo de hidrogênio.

Nesse monográfico constam a descrição das atividades realizadas durante o evento, a lista de professores e pesquisadores que se envolveram na organização, bem como os trabalhos completos e resumos expandidos provenientes das apresentações de trabalho nas sessões de pôsteres e comunicação oral. Esperamos que o material aqui disponível seja fonte de inspiração e pesquisa para a comunidade de computação, comunicação, informação, e metrologia e sensoriamento quântico.

Submissão e Avaliação de Trabalhos

O evento teve submissão de trabalhos científicos com datas definidas para envio e etapas de avaliação. Os trabalhos foram submetidos através da plataforma Even3, seguindo as instruções e modelos específicos (resumos estendidos e artigos completos) publicados no site oficial do evento. A seleção para apresentação oral e pôster foi feita com base em mérito científico e relevância temática, de acordo com os critérios definidos pelo comitê. Os critérios de análise de conteúdo incluem originalidade e aderência às áreas temáticas: computação quântica, metrologia e sensoriamento quântico, informação quântica e comunicação quântica.

Os formatos de submissão de trabalhos são: resumo simples, resumos estendidos de 2 páginas e artigos completos de até 5 páginas. Ressalta-se que os resumos simples não entram nos anais do evento. Após aprovação, os autores prepararam o material definitivo para apresentação no evento (oral ou pôster). A publicação nos anais do evento foi condicionada à apresentação do trabalho durante o evento. Apenas resumos estendidos (2 páginas) e artigos completos (5 páginas) são incluídos nos anais.

Organização dos Conteúdos

A organização dos conteúdos nos anais reflete as principais atividades realizadas entre 8 a 12 de dezembro de 2025:

• Sessões Técnicas: Apresentações orais em sessões técnicas com 15 minutos de duração mais 5 minutos de perguntas.
• Sessões de Pôsteres: Sessão de pôsteres 1 (8 de dezembro) e Sessão de pôsteres 2 (12 de dezembro), com duração de 90 minutos.
• Plenárias: Palestras com 50 minutos de duração mais 10 minutos de perguntas.
• Palestras Convidadas: Palestras com 25 minutos de duração mais 5 minutos de perguntas.
• Minicursos e Oficinas: Duração de 3h englobando temas como Processadores ópticos quânticos, Metrologia quântica e Programação quântica com Ket.
• Mesa-redonda: Discussão entre indústria e academia sobre o desenvolvimento da ciência e tecnologias quânticas no Brasil com duração de 1h.
• Apresentação dos patrocinadores: 15 minutos de apresentação da empresa de cada patrocinador, totalizando 90 minutos de programação.

Nestes anais o leitor encontrará o título e o resumo das palestras plenárias, das palestras convidadas, dos minicursos e a versão final revisada (camera ready) dos resumos estendidos e artigos completos.

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Programação do Evento

Segunda-feira, 8 de dezembro

Terça-feira, 9 de dezembro

(Programação remota devido a condições climáticas)

Quarta-feira, 10 de dezembro

Quinta-feira, 11 de dezembro

Sexta-feira, 12 de dezembro

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Plenary Sessions

• Title: The State and Impact of Quantum Computing
  • Speaker: Daniel Lidar (University of Southern California)
  • Description: Recent years have witnessed remarkable milestones in demonstrating quantum advantages. "Quantum supremacy" experiments have shown that current quantum devices can perform specific tasks beyond the reach of classical supercomputers, albeit for problems without immediate practical applications. Another ambitious goal is achieving "algorithmic quantum speedup", demonstrating quantum advantage for computational problems with known theoretical separations between quantum and classical complexity. This talk will examine these developments and their implications for the field, addressing both near-term applications and long-term prospects for quantum computing. Central to this discussion is the critical challenge of error mitigation and decoherence suppression, which remains the primary obstacle to scaling quantum systems. I will discuss current strategies for overcoming these limitations in the context of demonstrating quantum advantage using today's noisy quantum processors.
• Title: Quantum Technologies Engineering
  • Speaker: Gilberto Medeiros (Federal University of Minas Gerais)
  • Description: Recently, quantum sensing, communication and computation have been proposed as thrusts for research and technology that make use of quantum phenomena as key resources. In fact, the first reports on Rabi oscillations and NMR demonstrate that quantum sensing is far from a novel theme. The goal of this talk is to review selected challenges in terms of instrumentation of quantum technologies from an engineering perspective. Our activities have been taking place in our recently established Institute of Quantum and Nano Infrastructures for Convergent Applications, an organization that encompasses several states in Brazil and is chartered to promote collaborative efforts in instrumentation and engineering. First, these efforts will be covered more superficially, as some of the participants will be providing more detailed presentations and posters throughout this conference. The themes we shall address include quantum sensing, covering imaging of small structures and spatial resolution limits using microwaves, the development of an ultra-high vacuum tip-enhanced Raman spectroscopy microscope, and surface-enhanced Raman spectroscopy for sensing. Some of these examples have commercial applications that we will discuss briefly.
• Title: Characterizing and Suppressing Noise in Superconducting Qubits and Qudits
  • Speaker: Daniel Lidar (University of Southern California)
  • Description: This talk will address efficient noise characterization and multilevel noise suppression. In the first part, I will present our recent work on Deterministic Benchmarking, an efficient noise characterization method that captures coherent errors beyond standard stochastic error models. In the second part I will discuss dynamical decoupling for qutrits and higher multilevel systems. The results will be illustrated using transmon qubit experiments.
• Title: A Gate-Based Quantum Genetic Algorithm for Real-Valued Global Optimisation
  • Speaker: Renato Portugal (National Laboratory of Scientific Computing – LNCC/MCTI)
  • Description: We present a gate-based Quantum Genetic Algorithm (QGA) designed for real-valued global optimisation. Candidate solutions are represented as quantum circuits, whose measurement outcomes are mapped to real vectors. Evolutionary operators modify circuit structures, enabling both fixed- and variable-depth implementations. Fitness evaluation is performed through quantum sampling. Simulations on standard benchmark functions indicate that the use of superposition and entanglement accelerates convergence, lowers attainable fitness values, and increases robustness. These results underscore the promise of gate-based QGAs as a pathway toward quantum-enhanced optimisation.
• Title: Hybrid Quantum-Classical Approaches to Combinatorial Optimization
  • Speaker: Stuart Hadfield (NASA Ames Research Center)
  • Description: Despite advances in quantum hardware and algorithms, effectively using quantum computers for real-world problems remains challenging. Hard combinatorial optimization problems are attractive targets for quantum enhancements. While quantum annealers and gate-model devices have progressed, they still need substantial improvements to compete with sophisticated classical solvers. This has led to hybrid quantum-classical approaches that maximize classical computational power while assigning reduced tasks to quantum devices as subroutines. This talk explores two promising directions: first, Noise-Directed Adaptive Remapping (NDAR), a meta-heuristic algorithm that leverages noise to solve binary optimization problems, showing significant improvements on an 82-qubit device. Second, Iterative Quantum Algorithms (IQA), which embed quantum subroutines within proven classical algorithms like greedy or local search methods. We argue that hybrid approaches offer a promising path toward quantum utility with near-future devices.
• Title: Structured-Light Tomography for Quantum Communication
  • Speaker: Antônio Zelaquett Khoury (Federal Fluminense University)
  • Description: We study the tomography of spatial qudits encoded on structured light photons in the space of fixed order transverse modes. While direct position measurements with cameras do not provide an informationally complete Positive Operator Valued Measure (POVM), this property is achieved with the use of astigmatic transformation, allowing full characterization of the spatial quantum state from simple intensity measurements in both the intense and in the low photocount regimes. These methods are useful for classical and quantum communication with structured light.
• Title: Exploring Optical Processing with Quantum-Structured Light
  • Speaker: Paulo Henrique Souto Ribeiro (Federal University of Santa Catarina)
  • Description: In this talk, I will present recent advances in the use of spatially structured light for information processing, also exploring quantum properties of light that offer advantages over classical approaches. In particular, I will discuss the use of entanglement in the transverse spatial degrees of freedom of light to prepare single-photon states capable of performing mathematical operations in an efficient and innovative way.

Invited Talks

• Building and Testing Qubits (Alexandre de Souza - CBPF) 
• The talk will cover the fundamental principles and challenges involved in designing, fabricating, and characterizing qubits. Topics will include device design, microfabrication techniques, low-temperature measurements, and quantum coherence analysis. The goal is to provide an overview of the practical and theoretical steps required to develop superconducting qubits.
• From Search to Structure: Connecting Quantum Walks and Variational Algorithms (Franklin de Lima Marquezino - UFRJ)
• Quantum algorithms for search and optimization can be viewed through two complementary paradigms: variational quantum circuits and quantum walks. Each offers distinct insights into how interference, structure, and parameterization shape computational performance. In this talk, I will explore connections between Grover-inspired variational algorithms and spatial quantum walks on graphs, highlighting analytical and numerical results from both approaches. Topics will include expressivity and performance bounds in Grover-based QAOA, as well as the role of potentials and self-loops in enhancing or degrading quantum walk search under realistic noise. The discussion concludes with reflections on how these ideas inform the design, simulation, and teaching of quantum optimization algorithms using frameworks such as Qiskit.
• Quantum Computing in Materials Discovery (Mathias B. Steiner - IBM)
•  The application of quantum computing is transforming chemistry and materials science. In this presentation, I will outline how our team combines quantum algorithms with first-principles simulations and AI tools for improving computational discovery outcomes. As application examples, we explore materials for carbon dioxide capture and energy storage.
• MW Quantum Sensors Using Hot Rydberg Atoms (Luis Gustavo Marcassa - USP)
• Atom-based sensing systems provide exceptional advantages owing to their intrinsic self-calibration as quantum entities. The physical properties of atoms are identical for all atoms of a given species, regardless of their location in the universe. This fundamental stability, anchored in the constants of nature, offers major benefits, as atomic systems are inherently immune to manufacturing variations and aging effects. In this context, Rydberg atoms have garnered significant attention in recent years due to their extraordinarily wide range of transition frequencies, extending from 1 MHz to 1 THz. This extensive range stems from the Coulomb potential, which gives rise to an infinite series of electronic states and, consequently, an infinite number of Rydberg transitions. These transitions exhibit exceptionally large dipole matrix elements, often exceeding those of the D* transition in alkali atoms by factors of 100 to 1000. Such properties make Rydberg atoms extraordinarily sensitive to electromagnetic radiation across their transition frequency spectrum. In this seminar, I will discuss the use of hot Rydberg atoms as microwave quantum sensors and their potential to drive progress in quantum technologies.
  
• BosonSampling with a Linear Number of Modes (Daniel Brod - UFF)
• BosonSampling is one of the leading candidate models for a demonstration of quantum computational advantage. However, there are still important gaps between our best theoretical results and what can be implemented realistically in the laboratory. One of the largest gaps concerns the scaling between the number of modes (m) and number of photons (n) in the experiment. The original proposal by Aaronson and Arkhipov, as well as all subsequent improvements, required m to scale as n^2, whereas most state-of-the-art typically operate in a regime where m is linear in n. In this talk, I will describe how our recent work bridges this gap by providing evidence that BosonSampling remains hard even for m as low as 2n. I will review the template for proofs of computational advantage used in BosonSampling and other proposals, and discuss how we solved the new challenges that appear in this regime.
  
• Twin-Field QKD: Fundamentals and Implementation Challenges (Guilherme Penello Temporão - PUC-Rio)
• The Twin-Field QKD (TF-QKD) protocol was proposed as an innovative solution to overcome the maximum range limitations in quantum cryptography systems. By exploring interference between weak coherent states sent by Alice and Bob and measured at an intermediate node, Charlie, TF-QKD enables secret key rates that scale more favorably with distance, making QKD systems more resilient to channel losses. This talk will discuss the fundamentals and experimental challenges of TF-QKD, including phase and polarization stabilization in long optical links, synchronization between independent transmitters, and noise mitigation. New optical system architectures aimed at integrating multiple nodes in the same quantum network will also be presented, enabling the practical implementation of a metropolitan quantum communications infrastructure.

• Electrical Energy Cost of Arbitrary State Preparation (Pierre Louis de Assis - UNICAMP)
• As quantum computing platforms transition from laboratory proofs-of-principle to larger-scale computers, and technology and algorithms mature, it is important to start considering what might be the energetic cost of using quantum computers to perform meaningful tasks. Programmable photonics are typically composed of arrays of Mach-Zehnder Interferometers (MZI), each equipped with two phase modulators. It has been known for over three decades that such arrays can implement arbitrary unitary operations on N optical modes, serving as resources for (Gaussian) boson sampling computations and arbitrary operations on qudits. While they are not by themselves universal for quantum computation on qubits, it is possible to use them to implement the necessary gates, in (probabilistic or quasi-deterministic) gate-based linear optical quantum computing (LOQC), as well as to implement the adaptive measurements in measurement- and fusion-based photonic quantum computing (MBQC and FBQC). In this work, we discuss the energy costs related to programming these arrays, considering integrated photonic circuits made of waveguides and electro-optical modulators, to perform arbitrary quantum state preparation. This task was chosen because its exponential difficulty can serve as a tentative upper bound to the expected energy consumption of a given platform. We will focus on gate-based approaches, for which there are well-established optimized protocols, and discuss the implications for MBQC and FBQC, which are currently hegemonic in LOQC.
  
• Beyond Static Noise Mitigation: Drift-Resilient SPAM (Jader Pereira dos Santos - Hebrew University)
• Despite significant advances in quantum hardware, noise remains a major obstacle to achieving practical quantum advantage. While full Quantum Error Correction (QEC) represents the long-term solution, its resource requirements are unfeasible for current Noisy Intermediate-Scale Quantum (NISQ) devices. In the NISQ era, Quantum Error Mitigation (QEM) techniques are therefore essential for extracting meaningful results. This presentation introduces a novel framework for mitigating State Preparation and Measurement (SPAM) errors. Our method is specifically designed to be resilient to temporal drift, a critical challenge for conventional static calibration methods*and is fully compatible with other existing QEM protocols.
  

Tutorials (Short Courses)

• Quantum Optical Processors (Nara Rubiano da Silva - UFSC)
• Introduction to optical processors; review of classical and quantum optics fundamentals; classical optical processors; quantum optical processors; perspectives for quantum optical processors; final remarks.
• Introduction to Quantum Metrology (Sérgio Ricardo Muniz - USP)
• What is Quantum Metrology; quantum limits of precision; quantum squeezing and squeezed states; quantum sensors for electric and magnetic field measurements; impact on technology, medicine and science.
• Introduction to Quantum Programming with Ket (Evandro Chagas Ribeiro da Rosa - UFSC & Quantuloop)
• Introduction to quantum computing; fundamental concepts of superposition and entanglement; overview of the Ket quantum programming language; development of accelerated quantum applications; testing and practical experimentation with Ket; interaction and clarification of doubts.

Mesa-redonda

A mesa-redonda foi formada pelos representantes das empresas patrocinadoras Alexandre Pfeifer (IBM Brasil), Christiano Moreira de Sá do Nascimento (SENAI-CIMATEC e PUC-RJ), Daniel de Haro Moraes (Venturus Centro de Inovação Tecnológica) e Fernando Caletti (Instituto Eldorado), além do prof. Dr. João Terêncio Dias (CEFET-RJ) que representou a voz da universidade e atuou como mediador. Os temas abordados na mesa-redonda discutiam a interação entre indústria e academia em ciência e tecnologias quânticas, o mercado brasileiro, como inovar nesse setor no Brasil, além de discutir os próximos passos para a agenda quântica brasileira.

Apresentação dos patrocinadores

Os patrocinadores do evento tiveram 15 minutos cada um para apresentar a sua empresa ou centro de pesquisa e as suas contribuições para a ciência e tecnologias quânticas no Brasil. Alexandre Pfeifer apresentou a IBM Brasil, Guilherme Penello Temporão o SENAI-CIMATEC, Daniel de Haro Moraes a Venturus Centro de Inovação Tecnológica, Fernando Caletti e Pâmela Bezerra apresentaram o Instituto Eldorado e José Reis a Rohde&Schwarz Brazil. Após cada apresentação os apresentadores responderam uma ou duas perguntas da plateia.

Agradecimentos

Gostaríamos de expressar os nossos agradecimentos à Universidade Federal de Santa Catarina por aceitar e abraçar a realização deste evento na instituição. Nossos sinceros agradecimentos às instituições representadas pela comissão organizadora (UFSC, UFRJ, UFCA, UFPE, CEFET-RJ, PUC-RJ, UFMS e UFCA) por apoiar e liberar os professores e estudantes para participar da organização do evento. Agradecemos também ao CNPq, a SBMAC, os patrocinadores diamante (IBM), ouro (QuIIN, Venturus e Eldorado), e prata (Rohde&Schwarz) que acreditaram e nos ajudaram no fomento das nossas demandas. Destaco o apoio da empresa Mip Wise e da ACATE, pelo engajamento na interação entre indústria e universidade. Aproveitamos para agradecer aos palestrantes que abrilhantaram esse workshop-escola, ao Comitê Científico, responsável pela revisão e seleção dos trabalhos aprovados, aos autores pelos excelentes trabalhos apresentados, e a todos(as) os(as) servidores(as) e alunos que se voluntariaram e se dedicaram na realização deste evento. Agradecemos também o empenho da secretária do evento Flávia Rau, que não mediu esforços para que o evento ocorresse da melhor forma possível. E, por fim, e não menos especial, agradecemos a você, participante do VIII <WECIQ|WCQ>, que esteve conosco nesses dias de grande troca de conhecimentos.