90 citations · 542 across the 26 of their papers we have counts for
26 papers
Grand Unification of continuous-variable codes
Allan D. C. Tosta, Thiago O. Maciel, Leandro Aolita
Quantum error correction codes in continuous variables (also called CV codes, or single-mode bosonic codes) have recently been identified to be a technologically viable option for…
Genuine Multipartite Correlations in a Boundary Time Crystal
Antônio C. Lourenço, Luis Fernando dos Prazeres, Thiago O. Maciel +2
In this work we study genuine multipartite correlations (GMC's) in a boundary time crystal (BTC). Boundary time crystals are nonequilibrium quantum phases of matter in contact to a…
Quantum correlations, entanglement spectrum and coherence of two-particle reduced density matrix in the Extended Hubbard Model
Diego L. B. Ferreira, Thiago O. Maciel, Reinaldo O. Vianna +1
We study the ground state properties of the one-dimensional extended Hubbard model at half-filling from the perspective of its particle reduced density matrix. We focus on the redu…
QBoost for regression problems: solving partial differential equations
Caio B. D. Góes, Thiago O. Maciel, Giovani G. Pollachini +3
A hybrid algorithm based on machine learning and quantum ensemble learning is proposed that is capable of finding a solution to a partial differential equation with good precision…
A hybrid classical-quantum approach to solve the heat equation using quantum annealers
Giovani G. Pollachini, Juan P. L. C. Salazar, Caio B. D. Goes +2
The numerical solution of partial differential equations by discretization techniques is ubiquitous in computational physics. In this work we benchmark this approach in the quantum…
Simple and maximally robust processes with no classical common-cause or direct-cause explanation
Marcello Nery, Marco Túlio Quintino, Philippe Allard Guérin +2
Guided by the intuition of coherent superposition of causal relations, recent works presented quantum processes without classical common-cause and direct-cause explanation, that is…
Promoting quantum correlations in DQC1 model via post-selection
Elisa I. Goettems, Thiago O. Maciel, Diogo O. Soares-Pinto +1
The deterministic quantum computation with one qubit (DQC1) model is a restricted model of quantum computing able to calculate efficiently the normalized trace of a unitary matrix.…
Quantum Statistical Complexity Measure as a Signalling of Correlation Transitions
André T. Cesário, Diego L. B. Ferreira, Tiago Debarba +3
We introduce a quantum version for the statistical complexity measure, in the context of quantum information theory, and use it as a signalling function of quantum order-disorder t…
Automated Machine Learning can Classify Bound Entangled States with Tomograms
Caio B. D. Goes, Askery Canabarro, Eduardo I. Duzzioni +1
For quantum systems with a total dimension greater than six, the positive partial transposition (PPT) criterion is sufficient but not necessary to decide the non-separability of qu…
Genuine Multipartite Correlations Distribution in the Criticality of Lipkin-Meshkov-Glick Model
Antônio C. Lourenço, Susane Calegari, Thiago O. Maciel +3
Correlations play a key role in critical phenomena. Quantities such as the entanglement entropy, for instance, provide key insights into the mechanisms underlying quantum criticali…
Probing Genuine Multipartite Entanglement in Large Systems
Lucas B. Vieira, Diego L. Braga Ferreira, Thiago O. Maciel +1
We introduce a new kind of Entanglement Witness which is appropriate for studying genuine multipartite entanglement in large systems. The witness operator has a form that fits natu…
Most incompatible measurements for robust steering tests
Jessica Bavaresco, Marco Túlio Quintino, Leonardo Guerini +3
We address the problem of characterizing the steerability of quantum states under restrictive measurement scenarios, i.e., the problem of determining whether a quantum state can de…
Error regions in quantum state tomography: computational complexity caused by geometry of quantum states
Daniel Suess, Łukasz Rudnicki, Thiago O. Maciel +1
The outcomes of quantum mechanical experiments are inherently random. It is therefore necessary to develop stringent methods for quantifying the degree of statistical uncertainty a…
Dynamical matrix for arbitrary quadratic fermionic bath Hamiltonians and non-Markovian dynamics of one and two qubits in an Ising model environment
Fernando Iemini, Leonardo da Silva Souza, Tiago Debarba +3
We obtain the analytical expression for the Kraus decomposition of the quantum map of an environment modeled by an arbitrary quadratic fermionic Hamiltonian acting on one or two qu…
Entanglement of indistinguishable particles as a probe for quantum phase transitions in the extended Hubbard model
Fernando Iemini, Thiago O. Maciel, Reinaldo O. Vianna
We investigate the quantum phase transitions of the extended Hubbard model at half-filling with periodic boundary conditions employing the entanglement of particles, as opposed to…
Quantum process tomography with informational incomplete data of two -coupled heterogeneous spins relaxation in a time window much greater than
Thiago O. Maciel, Reinaldo O. Vianna, Roberto S. Sarthour +1
We reconstruct the time dependent quantum map corresponding to the relaxation process of a two-spin system in liquid-state NMR at room temperature. By means of quantum tomography t…
Inferring latent structures via information inequalities
R. Chaves, L. Luft, T. O. Maciel +3
One of the goals of probabilistic inference is to decide whether an empirically observed distribution is compatible with a candidate Bayesian network. However, Bayesian networks wi…
Minimum tomography of two entangled qutrits using local measurements of one-qutrit SIC-POVM
W. M. Pimenta, B. Marques, T. O. Maciel +4
An experimental demonstration of two-qutrit state tomography via one-qutrit symmetric informationally complete positive operator-valued measure (SIC-POVM) is presented. A two-qutri…
Quantum State Tomography with incomplete data: Maximum Entropy and Variational Quantum Tomography
D. S. Gonçalves, C. Lavor, M. A. Gomes-Ruggiero +3
Whenever we do not have an informationally complete set of measurements, the estimate of a quantum state can not be uniquely determined. In this case, among the density matrices co…
Reply to "Comment on 'Witnessed entanglement and the geometric measure of quantum discord' "
Tiago Debarba, Thiago O. Maciel, Reinaldo O. Vianna
We show that the mistakes pointed out by Rana and Parashar [Phys. Rev. A 87, 016301 (2013)] do not invalidate the main conclusion of our work [Phys. Rev. A 86, 024302 (2012)]. We s…
Witnessed entanglement and the geometric measure of quantum discord
Tiago Debarba, Thiago O. Maciel, Reinaldo O. Vianna
We establish relations between geometric quantum discord and entanglement quantifiers obtained by means of optimal witness operators. In particular, we prove a relation between neg…
Quantifying Quantum Correlations in Fermionic Systems using Witness Operators
Fernando Iemini, Thiago O. Maciel, Tiago Debarba +1
We present a method to quantify quantum correlations in arbitrary systems of indistinguishable fermions using witness operators. The method associates the problem of finding the op…
Experimental implementation of a NMR entanglement witness
J. G. Filgueiras, T. O. Maciel, R. E. Auccaise +3
Entanglement witnesses (EW) allow the detection of entanglement in a quantum system, from the measurement of some few observables. They do not require the complete determination of…
Optimal estimation of quantum processes using incomplete information: variational quantum process tomography
Thiago O. Maciel, Reinaldo O. Vianna
We develop a quantum process tomography method, which variationally reconstruct the map of a process, using noisy and incomplete information about the dynamics. The new method enco…