Quantum Computation and Information Seminar 

05/07/2013, 15:00 — 16:00 — Room P4.35, Mathematics Building
Jeroen van de Graaf, Universidade Federal de Minas Gerais

Fast key distribution with security from quantum-optical noise

The quantum-mechanical description of coherent light, as produced by lasers, gives rise to an intrinsic noise, known as quantum noise, optical noise or shot noise. Several protocols have been proposed to exploit this physical phenomenon to obtain secure data encryption and key distribution, including AlphaEta. Here we focus on the cryptographic aspects of a variant presented by Barbosa [PRA 2003] and propose an improvement, which is inspired on the concept of a pool of randomness as used by random bit generators in operating systems. This research in progress is a colaboration with Gabriel Almeida and Geraldo A. Barbosa.