Preprints

    1 a 15 de 28 Preprints encontradas Ano: 2021

  • Data-driven study of the COVID-19 pandemic via age-structured modelling and prediction of the health system failure in Brazil amid diverse intervention strategies
    Askery Canabarro, Elayne Tenório, Renato Martins, Laís Martins, Samuraí Brito, Rafael Chaves
  • Ab-initio experimental violation of Bell inequalities
    Davide Poderini, Emanuele Polino, Giovanni Rodari, Alessia Suprano, Rafael Chaves, Fabio Sciarrino
  • Exclusivity graph approach to Instrumental inequalities
    Davide Poderini, Rafael Chaves, Iris Agresti, Gonzalo Carvacho, Fabio Sciarrino
  • Quantum Markov monogamy inequalities
    Matheus Capela, Lucas C. Céleri, Rafael Chaves, Kavan Modi
  • Experimental device-independent certified randomness generation with an instrumental causal structure
    Iris Agresti, Davide Poderini, Leonardo Guerini, Michele Mancusi, Gonzalo Carvacho, Leandro Aolita, Daniel Cavalcanti, Rafael Chaves, Fabio Sciarrino
  • Quantum communication complexity beyond Bell nonlocality
    Joseph Ho, George Moreno, Samuraí Brito, Francesco Graffitti, Christopher L. Morrison, Ranieri Nery, Alexander Pickston, Massimiliano Proietti, Rafael Rabelo, Alessandro Fedrizzi, Rafael Chaves
  • Statistical Properties of the Quantum Internet
    Samuraí Brito, Askery Canabarro, Rafael Chaves, Daniel Cavalcanti
  • Minkowski structure for purity and entanglement of Gaussian bipartite states
    Marcos C. de Oliveira, Fernando Nicacio, Salomon S. Mizrahi
  • Causal Networks and Freedom of Choice in Bell’s Theorem
    Rafael Chaves, George Moreno, Emanuele Polino, Davide Poderini, Iris Agresti, Alessia Suprano, Mariana R. Barros, Gonzalo Carvacho, Elie Wolfe, Askery Canabarro, Robert W. Spekkens, Fabio Sciarrino
  • Device-independent secret sharing and a stronger form of Bell nonlocality
    M. G. M. Moreno, Samuraí Brito, Ranieri V. Nery, Rafael Chaves
  • Weyl–Wigner representation of canonical equilibrium states
    F Nicacio

    The Weyl-Wigner representations for canonical thermal equilibrium quantum states are obtained for the whole class of quadratic Hamiltonians through a Wick rotation of the Weyl-Wigner symbols of Heisenberg and metaplectic operators. The behavior of classical structures inherently associated to these unitaries is described under the Wick mapping, unveiling that a thermal equilibrium state is fully determined by a complex symplectic matrix, which sets all of its thermodynamical properties. The four categories of Hamiltonian dynamics (Parabolic, Elliptic, Hyperbolic, and Loxodromic) are analyzed. Semiclassical and high temperature approximations are derived and compared to the classical and/or quadratic behavior.

  • General Method for Classicality Certification in the Prepare and Measure Scenario
    Carlos de Gois, George Moreno, Ranieri Nery, Samuraí Brito, Rafael Chaves, Rafael Rabelo
  • Bell nonlocality using tensor networks and sparse recovery
    I. S. Eliëns, S. G. A. Brito, R. Chaves
  • Williamson theorem in classical, quantum, and statistical physics
    F. Nicacio

    The objective of this text is to present (and encourage the use of) the Williamson theorem and its consequences in several contexts in physics. The demonstration of the theorem is performed using only basic concepts of linear algebra and symplectic matrices. The immediate application is to place the study of small oscillations in the Hamiltonian scenario, where the theorem shows itself as a useful and practical tool for revealing the normal-mode coordinates and frequencies of the system. A modest introduction of the symplectic formalism in quantum mechanics is presented, which consequently opens up the use of the theorem to study quantum normal modes and quantum small oscillations, allowing the theorem to be applied to the canonical distribution of thermodynamically stable systems described by quadratic Hamiltonians. As a last example, a more advanced topic concerning uncertainty relations is developed to show once more its utility in a distinct and modern perspective.

  • Semi-device-independent certification of entanglement in superdense coding
    George Moreno, Ranieri Nery, Carlos de Gois, Rafael Rabelo, Rafael Chaves