Marcos received his M.Sc. and Ph.D in Telecommunication Engineering from Vigo University in 1999 and 2004 respectively. In 2001 he joined the Quantum Information Theory Group at the University of Erlangen-Nürnberg and he obtained a Ph.D in Physics (2006) under the supervision of Prof. Norbert Lütkenhaus. After postdoc positions at Toronto University (Prof. Hoi-Kwong Lo) and at the Institute for Quantum Computing, Waterloo University (Prof. Norbert Lütkenhaus), he joined the department of Electronic and Communications Engineering at Zaragoza University as Assistant Professor. Currently he is Professor at the department of Theory of Signal and Communications at Vigo University. His research interest lies in quantum information processing, particularly quantum cryptography.