Memorias de investigación
Research Project:

Research Areas
  • Information technology and adata processing

Quantum cryptography is the only known method able to distribute an informationally secure secret key. Two partners connected through a quantum link can produce a key that, to any certainty level desired, is secure. This security is based on the laws of physics, in contrast with common methods like RSA based on unproven assumptions in computational complexity. However, this does not imply a trouble-free technology, since not only the manipulation and transmission of the extremely weak single quanta is a very demanding task, but also the laws of nature impose limits on what can be achieved. As a result, it has a basic point to point structure with links limited in distance (absorptions). To fulfill its potential, a network must be done out of them. To overcome the distance problem, there are only two approaches: either quantum repeaters or trusted repeater nodes. Today, the only feasible approach is the second. Trusted repeaters know all the keys that pass through them, weakening the security of the network. To alleviate these problems, we propose a weakly trusted repeater network model that, based on network coding, can force the attacker to simultaneously break all possible links if he wants to get access to the key. This significantly improves both, the security and resiliency of the network.
Project type
Proyectos y convenios en convocatorias públicas competitivas
Ministerio de Economía y Competitividad (MINECO)
Entity Nationality
Entity size
Granting date

Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Grupo de investigación en Información y Computación Cuántica (GIICC)
  • Departamento: Tecnología Fotónica y Bioingeniería
  • Grupo de Investigación: Polinomios Ortogonales y Geometría Fractal
  • Departamento: Electrónica Física
  • Departamento: Matemática Aplicada a Las Tecnologías de la Información y Las Comunicaciones
  • Centro o Instituto I+D+i: Centro de Investigación en Simulación Computacional
  • Departamento: Lenguajes y Sistemas Informáticos e Ingeniería de Software