256 citations · 960 across the 9 of their papers we have counts for
7 papers · 1 filter
Experimental investigation of the dynamics of entanglement: Sudden death, complementarity, and continuous monitoring of the environment
A. Salles, F. Melo, M. P. Almeida +4
We report on an experimental investigation of the dynamics of entanglement between a single qubit and its environment, as well as for pairs of qubits interacting independently with…
Quantum key distribution with higher-order alphabets using spatially-encoded qudits
S. P. Walborn, D. S. Lemelle, M. P. Almeida +1
We propose and demonstrate a quantum key distribution scheme in higher-order -dimensional alphabets using spatial degrees of freedom of photons. Our implementation allows for th…
Theoretical investigation of moiré patterns in quantum images
M. P. Almeida, P. H. Souto Ribeiro, J. A. O. Huguenin +1
Moiré patterns are produced when two periodic structures with different spatial frequencies are superposed. The transmission of the resulting structure gives rise to spatial beatin…
Moiré patterns in quantum images
J. A. O. Huguenin, M. P. Almeida, P. H. Souto Ribeiro +1
We observed moiré fringes in spatial quantum correlations between twin photons generated by parametric down-conversion. Spatially periodic structures were nonlocally superposed giv…
Experimental investigation of quantum key distribution with position and momentum of photon pairs
M. P. Almeida, S. P. Walborn, P. H. Souto Ribeiro
We investigate the utility of Einstein-Podolsky-Rosen correlations of the position and momentum of photon pairs from parametric down-conversion in the implementation of a secure qu…
Conservation of Orbital Angular Momentum in Stimulated Down-Conversion
D. P. Caetano, M. P. Almeida, P. H. Souto Ribeiro +3
We report on an experiment demonstrating the conservation of orbital angular momentum in stimulated down-conversion. The orbital angular momentum is not transferred to the individu…