203 citations · 310 across the 15 of their papers we have counts for
17 papers
A wireless secure key distribution system with no couriers: a One-Time-Pad Revival
Geraldo A Barbosa
Among the problems to guarantee secrecy for in-transit information, the difficulties involved in renewing cryptographic keys in a secure way using couriers, the perfect secrecy enc…
Quantum key distribution by phase flipping of coherent states of light
G. A. Barbosa, J. van de Graaf, P. Mateus +1
In this paper we present quantum key distribution protocol that, instead of single qubits, uses mesoscopic coherent states of light to encode bit values of a randomly g…
A wireless physically secure key distribution system
Geraldo A. Barbosa
A secure key distribution protocol protected by light's noise was introduced in 2003 [Phys. Rev. A 68, 052307 (2003)]. That protocol utilized the shot noise of light present in the…
Untappable key distribution system: a one-time-pad booster
Geraldo A. Barbosa, Jeroen van de Graaf
One-time-pad (OTP) encryption simply cannot be cracked, even by a quantum computer. The need of sharing in a secure way supplies of symmetric random keys turned the method almost o…
Can humans see beyond intensity images?
Geraldo A. Barbosa
The human's visual system detect intensity images. Quite interesting, detector systems have shown the existence of different kind of images. Among them, images obtained by two dete…
Transverse coincidence-structures in spontaneous parametric down-conversion with orbital angular momentum: Theory
Geraldo A. Barbosa
Coincidence-structures in the transverse plane of Type-II spontaneous parametric down-conversion carrying orbital angular momentum are obtained. Azimuthal symmetry breaking around…