Seminário Segurança de Informação 

09/11/2007, 15:00 — 16:00 — Sala P4.35, Pavilhão de Matemática
Paulo Mateus, Instituto Superior Técnico

Contract signing with decoherence

We present a fair contract signing protocol without communication with a judge during the exchange phase. To this end we use particular Werner states and assume that the agents have no control over the system decoherence. Finally, we show how to implement such Werner states and discuss some limitations and extensions of the proposed protocol (joint work with J. Bouda and N. Paunkovic).