69 citations · 297 across the 20 of their papers we have counts for
20 papers
Flat-band quantum communication induced by disorder
G. M. A. Almeida, R. F. Dutra, A. M. C. Souza +2
We show that a qubit transfer protocol can be realized through a flat band hosted by a disordered spin-1/2 diamond chain. In the absence of disorder, the transmission becomes…
Non-Rayleigh signal of interacting quantum particles
M. F. V. Oliveira, F. A. B. F. de Moura, A. M. C. Souza +2
The dynamics of two interacting quantum particles on a weakly disordered chain is investigated. Spatial quantum interference between them is characterized through the statistics of…
Rogue waves in quantum lattices with correlated disorder
A. R. C. Buarque, W. S. Dias, G. M. A. Almeida +2
We investigate the outbreak of anomalous quantum wavefunction amplitudes in a one-dimensional tight-binding lattice featuring correlated diagonal disorder. Such rogue-wave-like beh…
Binary Apollonian networks
Eduardo M. K. Souza, Guilherme M. A. Almeida
There is a well-known relationship between the binary Pascal's triangle and Sierpinski triangle in which the latter obtained from the former by successive modulo 2 additions on one…
Rogue waves in discrete-time quantum walks
A. R. C. Buarque, W. S. Dias, F. A. B. F. de Moura +2
Rogue waves are rapid and unpredictable events of exceptional amplitude reported in various fields, such as oceanography and optics, with much of the interest being targeted toward…
Universal dynamical scaling laws in three-state quantum walks
P. R. N. Falcão, A. R. C. Buarque, W. S. Dias +2
We perform a finite-time scaling analysis over the detrapping point of a three-state quantum walk on the line. The coin operator is parameterized by that controls the wavepacke…
Generation and distribution of atomic entanglement in coupled-cavity arrays
J. P. Mendonça, F. A. B. F. de Moura, M. L. Lyra +1
We study the dynamics of entanglement in a 1D coupled-cavity array, each cavity containing a two-level atom, via the Jaynes-Cummings-Hubbard (JCH) Hamiltonian in the single-excitat…
Localization properties of a two-channel 3D Anderson model
Andre M. C. Souza, Guilherme M. A. Almeida, Eduardo R. Mucciolo
We study two coupled 3D lattices, one of them featuring uncorrelated on-site disorder and the other one being fully ordered, and analyze how the interlattice hopping affects the lo…
Spin chains for two-qubit teleportation
Tony J. G. Apollaro, Guilherme M. A. Almeida, Salvatore Lorenzo +2
Generating high-quality multi-particle entanglement between communicating parties is the primary resource in quantum teleportation protocols. To this aim, we show that the natural…
Disorder-safe entanglement transfer through ladder qubit chains
Guilherme M. A. Almeida, Andre M. C. Souza, Francisco +3
We study an entanglement transfer protocol in a two-leg ladder spin-1/2 chain in the presence of disorder. In the regime where on-site energies and the intrachain couplings follow…
Interplay between speed and fidelity in off-resonant quantum-state transfer protocols
Guilherme M. A. Almeida
An arbitrary qubit can be transmitted through a spin chain by perturbatively coupling both communicating parties to it. Those so-called weak-coupling models rely on effective Rabi…
Noncommutative quantum Hall effect in graphene
Willien O. Santos, Guilherme M. A. Almeida, Andre M. C. Souza
We discuss the quantum Hall effect on a single-layer graphene in the framework of noncommutative (NC) phase space. We find it induces a shift in the Hall resistivity. Furthermore,…
Localization properties and high-fidelity state transfer in electronic hopping models with correlated disorder
Guilherme M. A. Almeida, Caio V. C. Mendes, Marcelo L. Lyra +1
We investigate a tight-binding electronic chain featuring diagonal and off-diagonal disorder, these being modelled through the long-range-correlated fractional Brownian motion. Par…
Entanglement generation between distant parties via disordered spin chains
Guilherme M. A. Almeida, Francisco A. B. F. de Moura, Marcelo L. Lyra
We study the emergence of bipartite entanglement between a pair of spins weakly connected to the ends of a linear disordered spin-1/2 channel. We analyze how their concurrence…
High-fidelity state transfer through long-range correlated disordered quantum channels
Guilherme M. A. Almeida, Francisco A. B. F. de Moura, Marcelo L. Lyra
We study quantum-state transfer in spin- chains where both communicating spins are weakly coupled to a channel featuring disordered on-site magnetic fields. Fluctuations…
Disorder-assisted distribution of entanglement in spin chains
Guilherme M. A. Almeida, Francisco A. B. F. de Moura, Tony J. G. Apollaro +1
We study the creation and distribution of entanglement in disordered -type spin- chains for the paradigmatic case of a single flipped spin prepared on a fully polarized ba…
Noncommutative Brownian motion
Willien O. Santos, Guilherme M. A. Almeida, Andre M. C. Souza
We investigate the classical Brownian motion of a particle in a two-dimensional noncommutative (NC) space. Using the standard NC algebra embodied by the sympletic Weyl-Moyal formal…
Quantum-state transfer in staggered coupled-cavity arrays
Guilherme M. A. Almeida, Francesco Ciccarello, Tony J. G. Apollaro +1
We consider a coupled-cavity array, where each cavity interacts with an atom under the rotating-wave approximation. For a staggered pattern of inter-cavity couplings, a pair of fie…
Anderson localization on the Falicov-Kimball model with Coulomb disorder
Rubens D. B. Carvalho, Guilherme M. A. Almeida, Andre M. C. Souza
The role of Coulomb disorder is analysed in the Anderson-Falicov-Kimball model. Phase diagrams of correlated and disordered electron systems are calculated within dynamical mean-fi…
Quantum transport with coupled cavities on the Apollonian network
Guilherme M. A. Almeida, André M. C. Souza
We study the dynamics of single photonic and atomic excitations in the Jaynes-Cummings-Hubbard (JCH) model where the cavities are arranged in an Apollonian network (AN). The existe…