Physics and Astronomy, Atomic and Molecular Physics, and Optics, Education
16
Scopus Publications
423
Scholar Citations
9
Scholar h-index
7
Scholar i10-index
Scopus Publications
Bell inequalities and the 2022 Nobel Prize in Physics Gustavo Balvedi Pimentel, Leonardo A. M. Souza, Romeu Rossi Jr., Bárbara Amaral Revista Brasileira De Ensino De Fisica, 2025 Resumo O debate científico, quando conduzido de forma aberta e fundamentada em metodologia, é motor essencial do avanço do conhecimento. Um dos exemplos mais marcantes é o confronto intelectual entre Albert Einstein e Niels Bohr, iniciado nos anos 1920 e intensificado em 1935 com a publicação do paradoxo EPR e a réplica imediata de Bohr. No centro da controvérsia estava a natureza do emaranhamento quântico e sua relação com conceitos como localidade, realidade física e completude da teoria quântica. Décadas mais tarde, em 1964, John Bell formulou um teorema que permitia testar experimentalmente as “variáveis ocultas locais” defendidas por abordagens como a de EPR. As desigualdades de Bell abriram caminho para experimentos que, ao longo de décadas, buscaram eliminar brechas experimentais (loopholes) e culminaram, em 2015, na realização de testes loophole free que confirmaram as previsões quânticas. Em 2022, três físicos envolvidos nessas investigações receberam o Prêmio Nobel de Física “por experimentos com fótons emaranhados estabelecendo violações de desigualdades de Bell, sendo pioneiros na ciência da informação quântica”. Este artigo revisa, de forma sistemática e didática, os fundamentos necessários para compreender as desigualdades de Bell, discute suas implicações filosóficas, algumas aplicações e apresenta a evolução histórica que levou do debate Einstein–Bohr às comprovações experimentais modernas.
High School students' perceptions about science, pseudoscience and antiscientific movements Mário Lucas Miguel, Leandro José Dos Santos, Leonardo Antônio Mendes de Souza Investigacoes Em Ensino De Ciencias, 2022 No presente trabalho, temos como objetivo analisar de forma qualitativa e interpretativa as concepções de alguns estudantes de ensino médio a respeito dos processos de produção e validação do conhecimento científico. Para isso, fizemos uma revisão a respeito dos conceitos de conhecimento, metodologias científicas, pseudociência, negacionismo e anticientificismo. Esses conceitos foram apresentados e discutidos dentro do contexto da atual revolução nas formas de comunicação e suas implicações. Para ilustrar esses conceitos, trouxemos temas que ganharam grande repercussão no ambiente virtual, como o crescimento de movimentos como Terraplanismo e Antivacinas, e também negacionismo com relação a mudanças climáticas. Elaboramos então um questionário que foi aplicado na forma de entrevistas semiestruturadas, para investigar como estudantes do ensino médio reagiriam a estes temas. Com nossa análise percebemos que os estudantes que entrevistamos têm uma visão dogmática de ciência e frequentemente confundem os termos “científico” e “verdadeiro”. Também confundem fatos científicos com opinião, especialmente quando se trata de ciências humanas. Estas observações podem estar associadas a uma defasagem na compreensão de aspectos relativos à produção do conhecimento científico, bem como as questões históricas e socioculturais que o permeiam. Tal abordagem é prevista nos documentos norteadores da educação Brasileira, mas conforme veremos, existe um abismo entre esses documentos e as escolas da rede pública.
Versatile Gaussian probes for squeezing estimation Luca Rigovacca, Alessandro Farace, Leonardo A. M. Souza, Antonella De Pasquale, Vittorio Giovannetti, et al. Physical Review A, 2017 We consider an instance of “black-box” quantum metrology in the Gaussian framework, where we aim to estimate the amount of squeezing applied on an input probe, without previous knowledge on the phase of the applied squeezing. By taking the quantum Fisher information (QFI) as the figure of merit, we evaluate its average and variance with respect to this phase in order to identify probe states that yield good precision for many different squeezing directions. We first consider the case of single-mode Gaussian probes with the same energy, and find that pure squeezed states maximize the average quantum Fisher information (AvQFI) at the cost of a performance that oscillates strongly as the squeezing direction is changed. Although the variance can be brought to zero by correlating the probing system with a reference mode, the maximum AvQFI cannot be increased in the same way. A different scenario opens if one takes into account the effects of photon losses: coherent states represent the optimal single-mode choice when losses exceed a certain threshold and, moreover, correlated probes can now yield larger AvQFI values than all single-mode states, on top of having zero variance.
Non-Markovianity Hierarchy of Gaussian Processes and Quantum Amplification Pietro Liuzzo-Scorpo, Wojciech Roga, Leonardo A. M. Souza, Nadja K. Bernardes, Gerardo Adesso Physical Review Letters, 2017 We investigate the dynamics of Gaussian states of continuous variable systems under Gaussianity-preserving channels. We introduce a hierarchy of such evolutions encompassing Markovian and weakly and strongly non-Markovian processes and provide simple criteria to distinguish between the classes, based on the degree of positivity of intermediate Gaussian maps. We present an intuitive classification of all one-mode Gaussian channels according to their non-Markovianity degree and show that weak non-Markovianity has an operational significance, as it leads to a temporary phase-insensitive amplification of Gaussian inputs beyond the fundamental quantum limit. Explicit examples and applications are discussed.
Gaussian interferometric power as a measure of continuous-variable non-Markovianity Leonardo A. M. Souza, Himadri Shekhar Dhar, Manabendra Nath Bera, Pietro Liuzzo-Scorpo, Gerardo Adesso Physical Review A Atomic Molecular and Optical Physics, 2015 We investigate the non-Markovianity of continuous-variable Gaussian quantum channels through the evolution of an operational metrological quantifier, namely, the Gaussian interferometric power, which captures the minimal precision that can be achieved using bipartite Gaussian probes in a black-box phase estimation setup, where the phase shift generator is a priori unknown. We observe that the monotonicity of the Gaussian interferometric power under the action of local Gaussian quantum channels on the ancillary arm of the bipartite probes is a natural indicator of Markovian dynamics; consequently, its breakdown for specific maps can be used to construct a witness and an effective quantifier of non-Markovianity. In our work, we consider two paradigmatic Gaussian models, the damping master equation and the quantum Brownian motion, and identify analytically and numerically the parameter regimes that give rise to non-Markovian dynamics. We then quantify the degree of non-Markovianity of the channels in terms of Gaussian interferometric power, showing, in particular, that even nonentangled probes can be useful to witness non-Markovianity. This establishes an interesting link between the dynamics of bipartite continuous-variable open systems and their potential for optical interferometry. The results are an important supplement to the recent research on characterization of non-Markovianity in continuous-variable systems.
Asymptotic entanglement dynamics phase diagrams for two electromagnetic field modes in a cavity R. C. Drumond, L. A. M. Souza, M. Terra Cunha Physical Review A Atomic Molecular and Optical Physics, 2010 We investigate theoretically an open dynamics for two modes of electromagnetic field inside a microwave cavity. The dynamics is Markovian and determined by two types of reservoirs: the ''natural'' reservoirs due to dissipation and temperature of the cavity, and an engineered one, provided by a stream of atoms passing trough the cavity, as devised by Pielawa et al. [Phys. Rev. Lett. 98, 240401 (2007)]. We found that, depending on the reservoir parameters, the system can have distinct ''phases'' for the asymptotic entanglement dynamics: it can disentangle at finite time or it can have persistent entanglement for large times, with the transition between them characterized by the possibility of asymptotical disentanglement. Incidentally, we also discuss the effects of dissipation on the scheme proposed in the above reference for generation of entangled states.
Gravitational Decoherence Estimation in Optomechanical Systems LAM Souza, OP Neto, E Russo, RL Franco, G Adesso arXiv preprint arXiv:2602.14841 , 2026 2026
Desigualdades de Bell eo prêmio Nobel de 2022 GB Pimentel, LAM Souza, R Rossi Jr, B Amaral Revista Brasileira de Ensino de Física 47 (Suppl 3), e20250442 , 2025 2025
Bell inequalities and the 2022 Nobel Prize in Physics GB Pimentel, LAM Souza, R Rossi Jr, B Amaral Revista Brasileira de Ensino de Física 47, e20250442 , 2025 2025
Uma proposta para o uso de RPG no Ensino de F\'isica: A Vingan\c {c} a de Newton MRVB Souza, LH de Freitas, GS Silva, FX de Carvalho, LAM Souza arXiv preprint arXiv:2411.17642 , 2024 2024 Citations: 2
A Precis\~ ao da Metrologia Qu\^ antica: Limite de Cram\'er-Rao, Informa\c {c}\~ ao de Fisher e poss\'iveis Aplica\c {c}\~ oes Tecnol\'ogicas LAM Souza arXiv preprint arXiv:2411.17797 , 2024 2024
Uma proposta para o uso de RPG no Ensino de Física: A Vingança de Newton MR Vasconcelos Brandão Souza, LH de Freitas, G de Souza Silva, ... arXiv e-prints, arXiv: 2411.17642 , 2024 2024
Classes of Gaussian states for squeezing estimation LAM Souza Physics Letters A 504, 129431 , 2024 2024 Citations: 7
Algumas percepções de estudantes do ensino médio sobre ciências, pseudociência e movimentos anticientíficos ML Miguel, LJ dos Santos, LAM de Souza Investigações em Ensino de Ciências 27 (1), 191-222 , 2022 2022 Citations: 14
Causal Emergence in Quantum Mechanics R Rossi Jr, LAM Souza arXiv preprint arXiv:1901.07471 , 2019 2019
Tests of hidden variable models by the relaxation of the measurement independence condition R Rossi Jr, LAM Souza arXiv preprint arXiv:1804.06452 , 2018 2018
Versatile Gaussian probes for squeezing estimation L Rigovacca, A Farace, LAM Souza, A De Pasquale, V Giovannetti, ... Physical Review A 95 (5), 052331 , 2017 2017 Citations: 19
Non-Markovianity hierarchy of Gaussian processes and quantum amplification P Liuzzo-Scorpo, W Roga, LAM Souza, NK Bernardes, G Adesso Physical Review Letters 118, 050401 , 2017 2017 Citations: 20
Maximizing complementary quantities by projective measurements LAM Souza, NK Bernardes, R Rossi Jr Brazilian Journal of Physics 47, 157 , 2017 2017
Gaussian interferometric power as a measure of continuous-variable non-Markovianity LAM Souza, HS Dhar, MN Bera, P Liuzzo-Scorpo, G Adesso Physical Review A 92 (5), 052122 , 2015 2015 Citations: 42
Parametric competition in non-autonomous Hamiltonian systems LAM Souza, JGP Faria, MC Nemes Optics Communications 331, 148-153 , 2014 2014 Citations: 4
Multipartite quantum eraser in cavity QED R Rossi Jr, JP Souza, LAM de Souza, MC Nemes Physical Review A—Atomic, Molecular, and Optical Physics 88 (6), 062102 , 2013 2013 Citations: 2
More... R Rossi, LAM Souza Proc. Nat. Acad. Sci 110, 19790 , 2013 2013 Citations: 3
Mixedness and entanglement for two-mode Gaussian states LAM Souza, RC Drumond, MC Nemes, KMF Romero Optics Communications 285 (21-22), 4453-4456 , 2012 2012 Citations: 7
Asymptotic entanglement dynamics phase diagrams for two electromagnetic field modes in a cavity RC Drumond, LAM Souza, M Terra Cunha Physical Review A—Atomic, Molecular, and Optical Physics 82 (4), 042302 , 2010 2010 Citations: 7
Optimal estimation of losses at the ultimate quantum limit with non-Gaussian states G Adesso, F Dell’Anno, S De Siena, F Illuminati, LAM Souza Physical Review A—Atomic, Molecular, and Optical Physics 79 (4), 040305 , 2009 2009 Citations: 228
MOST CITED SCHOLAR PUBLICATIONS
Optimal estimation of losses at the ultimate quantum limit with non-Gaussian states G Adesso, F Dell’Anno, S De Siena, F Illuminati, LAM Souza Physical Review A—Atomic, Molecular, and Optical Physics 79 (4), 040305 , 2009 2009 Citations: 228
Gaussian interferometric power as a measure of continuous-variable non-Markovianity LAM Souza, HS Dhar, MN Bera, P Liuzzo-Scorpo, G Adesso Physical Review A 92 (5), 052122 , 2015 2015 Citations: 42
Arbitrary parameters in implicit regularization and democracy within perturbative description of 2-dimensional gravitational anomalies LAM Souza, M Sampaio, MC Nemes Physics Letters B 632 (5-6), 717-724 , 2006 2006 Citations: 31
Non-Markovianity hierarchy of Gaussian processes and quantum amplification P Liuzzo-Scorpo, W Roga, LAM Souza, NK Bernardes, G Adesso Physical Review Letters 118, 050401 , 2017 2017 Citations: 20
Versatile Gaussian probes for squeezing estimation L Rigovacca, A Farace, LAM Souza, A De Pasquale, V Giovannetti, ... Physical Review A 95 (5), 052331 , 2017 2017 Citations: 19
Algumas percepções de estudantes do ensino médio sobre ciências, pseudociência e movimentos anticientíficos ML Miguel, LJ dos Santos, LAM de Souza Investigações em Ensino de Ciências 27 (1), 191-222 , 2022 2022 Citations: 14
Anomalous diffusion in the first-order Jovian resonance RR Cordeiro, LAM de Souza Astronomy & Astrophysics 439 (1), 375-385 , 2005 2005 Citations: 13
Quantifying the decay of quantum properties in single-mode states LAM Souza, MC Nemes, MF Santos, JGP de Faria Optics communications 281 (18), 4696-4704 , 2008 2008 Citations: 9
An analytical relation between entropy production and quantum Lyapunov exponents for Gaussian bipartite systems KMF Romero, JE Parreira, LAM Souza, MC Nemes, W Wreszinski Journal of Physics A: Mathematical and Theoretical 41 (11), 115303 , 2008 2008 Citations: 9
Classes of Gaussian states for squeezing estimation LAM Souza Physics Letters A 504, 129431 , 2024 2024 Citations: 7
Mixedness and entanglement for two-mode Gaussian states LAM Souza, RC Drumond, MC Nemes, KMF Romero Optics Communications 285 (21-22), 4453-4456 , 2012 2012 Citations: 7
Asymptotic entanglement dynamics phase diagrams for two electromagnetic field modes in a cavity RC Drumond, LAM Souza, M Terra Cunha Physical Review A—Atomic, Molecular, and Optical Physics 82 (4), 042302 , 2010 2010 Citations: 7
Characteristic time and maximum mixedness: Single mode Gaussian states in dissipative channels LAM Souza, MC Nemes Physics Letters A 372 (20), 3616-3619 , 2008 2008 Citations: 6
Parametric competition in non-autonomous Hamiltonian systems LAM Souza, JGP Faria, MC Nemes Optics Communications 331, 148-153 , 2014 2014 Citations: 4
More... R Rossi, LAM Souza Proc. Nat. Acad. Sci 110, 19790 , 2013 2013 Citations: 3
Uma proposta para o uso de RPG no Ensino de F\'isica: A Vingan\c {c} a de Newton MRVB Souza, LH de Freitas, GS Silva, FX de Carvalho, LAM Souza arXiv preprint arXiv:2411.17642 , 2024 2024 Citations: 2
Multipartite quantum eraser in cavity QED R Rossi Jr, JP Souza, LAM de Souza, MC Nemes Physical Review A—Atomic, Molecular, and Optical Physics 88 (6), 062102 , 2013 2013 Citations: 2
Gravitational Decoherence Estimation in Optomechanical Systems LAM Souza, OP Neto, E Russo, RL Franco, G Adesso arXiv preprint arXiv:2602.14841 , 2026 2026
Desigualdades de Bell eo prêmio Nobel de 2022 GB Pimentel, LAM Souza, R Rossi Jr, B Amaral Revista Brasileira de Ensino de Física 47 (Suppl 3), e20250442 , 2025 2025
Bell inequalities and the 2022 Nobel Prize in Physics GB Pimentel, LAM Souza, R Rossi Jr, B Amaral Revista Brasileira de Ensino de Física 47, e20250442 , 2025 2025
