52 citations · 345 across the 30 of their papers we have counts for
31 papers
Variable-mass sine-Gordon with point defects: integrability, soliton transmission, and quasi-conservation
A. R. Aguirre, H. Blas, H. F. Callisaya +1
We study integrable variable-mass sine-Gordon model (vmSG) with point defects. Using the Lax and Bäcklund-gauge formulations, we construct type-I and type-II defect matrices, deriv…
Scalable Quantum Walk-Based Heuristics for the Minimum Vertex Cover Problem
F. S. Luiz, A. K. F. Iwakami, D. H. Moraes +1
We propose a novel heuristic quantum algorithm for the Minimum Vertex Cover (MVC) problem based on continuous-time quantum walks (CTQWs). In this framework, the coherent propagatio…
Absorption-based qubit estimation in discrete-time quantum walks
Edgard P. M. Amorim, Lorena R. Cerutti, O. P. de Sá Neto +1
We investigate state estimation in discrete-time quantum walks with a single absorbing boundary. Using a spectral approach, we obtain closed expressions for the escape probability…
Tripartite State Characterization via Activated Bipartite Entanglement
L. G. E. Arruda, W. F. Balthazar, M. V. Moreira +3
We propose a procedure to identify and classify genuine tripartite entanglement in pure 3-qubit states via the Activated Bipartite Entanglement (ABE), which is defined here as the…
Temperature estimation of an entangled pair of trapped ions
O. P. de Sá Neto, H. A. S. Costa, G. A. Prataviera +1
We apply estimation theory to a system formed by two interacting trapped ions. By using the Fisher matrix formalism, we introduce a simple scheme for estimation of the temperature…
Spin-orbit implementation of Solovay-Kitaev decomposition of single-qubit channels
M. H. M. Passos, A. de Oliveira Junior, M. C. de Oliveira +2
The Solovay-Kitaev theorem allows us to approximate any single-qubit gate to arbitrary accuracy with a finite sequence of fundamental operations from a universal set of gates. Insp…
Correlation Redistribution by Causal Horizons
L. Pipolo de Gioia, M. C. de Oliveira
The Minkowski vacuum , which for an inertial observer is devoid of particles, is treated as a thermal bath by Rindler observers living in a single Rindler wedge, as a…
Mimicking the Hadamard discrete-time quantum walk with a time-independent Hamiltonian
Jalil Khatibi Moqadam, Marcos Cesar de Oliveira
The discrete-time quantum walk dynamics can be generated by a time-dependent Hamiltonian, repeatedly switching between the coin and the shift generators. We change the model and co…
Phase collapse and revival of a 1-mode Bose-Einstein condensate induced by an off-resonant optical probe field and superselection rules
L. G. E. Arruda, G. A. Prataviera, M. C. de Oliveira
Phase collapse and revival for Bose-Einstein condensates is a nonlinear phenomena appearing due atomic collisions. While it has been observed in a general setting involving many mo…
Simulating the discrete-time quantum walk dynamics with simultaneous coin and shift operators
Jalil Khatibi Moqadam, Marcos Cesar de Oliveira
We implement the discrete-time quantum walk model using the continuous-time evolution of the Hamiltonian that includes both the shift and the coin generators. Based on the Trotter-…
Microwave Photodetection with Electro-Opto-Mechanical Systems
Shabir Barzanjeh, M. C. de Oliveira, Stefano Pirandola
While detection of optical photons is today achieved with very high efficiencies, the detection of microwave fields at the photon level still poses non-trivial experimental challen…
Limitations imposed by complementarity
F. E. S. Steinhoff, M. C. de Oliveira
Complementarity is one of the main features of quantum physics that radically departs from classical notions. Here we consider the limitations that this principle imposes due to th…
Capacitive Coupling of Two Transmission Line Resonators Mediated by the Phonon Number of a Nanoelectromechanical Oscillator
O. P. de Sá Neto, M. C. de Oliveira, F. Nicacio +1
Detection of quantum features in mechanical systems at the nanoscale constitutes a challenging task, given the weak interaction with other elements and the available technics. Here…
Coherent control of phase diffusion in a Bosonic Josephson junction by scattering length modulation
J. Lozada-Vera, V. S. Bagnato, M. C. de Oliveira
By means of a temporal-periodic modulation of the s-wave scattering length, a procedure to control the evolution of an initial atomic coherent state associated with a Bosonic Josep…
Bipartite bound entanglement in continuous variables through deGaussification
F. E. S. Steinhoff, M. C. de Oliveira, J. Sperling +1
We introduce a class of bipartite entangled continuous variable states that are positive under partial transposition operation, i.e., PPT bound entangled. These states are based on…
Emergence of the pointer basis through the dynamics of correlations
M. F. Cornelio, O. Jiménez Farías, F. F. Fanchini +7
We use the classical correlation between a quantum system being measured and its measurement apparatus to analyze the amount of information being retrieved in a quantum measurement…
Hybrid Qubit gates in circuit QED: A scheme for quantum bit encoding and information processing
O. P. de Sa Neto, M. C. de Oliveira
Solid state superconducting devices coupled to coplanar transmission lines offer an exquisite architecture for quantum optical phenomena probing as well as for quantum computation…
Why the Entanglement of Formation is not generally monogamic
F. F. Fanchini, M. C. de Oliveira, L. K. Castelano +1
Differently from correlation of classical systems, entanglement of quantum systems cannot be distributed at will - if one system A is maximally entangled with another system B, it…
Locally Inaccessible Information as a Fundamental Ingredient to Quantum Information
F. F. Fanchini, L. K. Castelano, M. F. Cornelio +1
Quantum discord (QD) measures the fraction of the pairwise mutual information that is locally inaccessible, in a multipartite system. Fundamental aspects related to two important m…
Generation of Superposition States and Charge-Qubit Relaxation Probing in a Circuit
O. P. de Sa Neto, M. C. de Oliveira, A. O. Caldeira
We demonstrate how a superposition of coherent states can be generated for a microwave field inside a coplanar transmission line coupled to a single superconducting charge qubit, w…
Phase Transition, Entanglement and Squeezing in a Triple-Well Condensate
T. F. Viscondi, K. Furuya, M. C. de Oliveira
We provide an in-depth characterization of a three modes Bose-Einstein condensate trapped in a symmetric circular triple well potential. We analyze how a subsystem independent meas…
Families of bipartite states classifiable by the positive partial transposition criterion
F. E. S. Steinhoff, M. C. de Oliveira
We construct a family of bipartite states of arbitrary dimension whose eigenvalues of the partially transposed matrix can be inferred directly from the block structure of the globa…
State reconstruction of finite dimensional compound systems via local projective measurements and one-way classical communication
F. E. S. Steinhoff, M. C. de Oliveira
For a finite dimensional discrete bipartite system, we find the relation between local projections performed by Alice, and Bob post-selected state dependence on the global state su…
Coherent state approach to the cross collisional effects in the population dynamics of a two-mode Bose-Einstein condensate
Thiago F. Viscondi, K. Furuya, M. C. de Oliveira
We reanalyze the non-linear population dynamics of a Bose-Einstein Condensate (BEC) in a double well trap considering a semiclassical approach based on a time dependent variational…