The research group on Quantum Information and Computation, at the Universidad Politécnica de Madrid (UPM), comes from a different background. The core of members is formed by associate professors from the UPM, skilled in the areas of applied mathematics, networking and computational sciences, among others.
The group has experience in quantum key distribution (QKD), having installed the first point-to-point QKD link in the country together with Telefonica R&D. They have built a QKD network prototype, a test bed for QKD-based technologies where research on quantum protocols and its integration within standard optical communication networks is being carried out. This prototype is unique in that it departs with previous thinking about QKD networks but does not rely in complex intermediate trusted nodes connected through non-shared optical fibres. It intends to transmit quantum and conventional channels separateley over a single fibre, routing both through a common infrastructure made up of commercial grade equipment. Therefore, this network prototype relies then on commercial modules or equipment commonly used in shared optical infrastructures to build an optical path between two locations to pass the quantum channel together with the others.
The team members are also skilled in QKD post-processing and secret-key distillation, having proposed novel methods for efficient and high speed information reconciliation (error correction) in QKD.
C. Pacher, J. Martinez-Mateo, J. Duhme, T. Gehring, and F. Furrer, “Information Reconciliation for Continuous-Variable Quantum Key Distribution using Non-Binary Low-Density Parity-Check Codes,” submitted for publication, 2016 (arXiv:1602.09140 [quant-ph], PDF ).
A. Ciurana, V. Martin, J. Martinez-Mateo, B. Schrenk, M. Peev, A. Poppe, “Entanglement Distribution in Optical Networks,” IEEE Journal of Selected Topics in Quantum Electronics, vol. 21, no. 3, May-June 2015 (arXiv:1409.5965 [quant-ph], PDF , BibTEX , DOI).
J. Martinez-Mateo, C. Pacher, M. Peev, A. Ciurana, and V. Martin, “Demystifying the Information Reconciliation Protocol Cascade,” Quantum Information & Computation, vol. 15, no. 5&6, pp. 453-477, Apr. 2015 (arXiv:1407.3257 [quant-ph], PDF , BibTEX ).
A list of low-density parity-check codes and matrices particularly optimized for different coding rates and communication channels.