Quantum Computation and Information Seminar 

01/06/2012, 15:00 — 16:00 — Room P4.35, Mathematics Building
Arnaldo Gouveia, SQIG - IT

An overview of the E91 protocol

In the current Quantum Key Distribution (QKD) proposals it is possible to generate a secret key and distribute it with the involved parties separated in physical terms. This possibility opens the possibility of structuring a solution to the classical cryptography problem of key distribution with reduced interaction among involved parties. Among other proposals to address this issue is the Eckert 91 protocol which will be in the scope of this report. Proposed in 1991 by A. Eckert it is an entanglement based protocol. The security assurance of entanglement based protocols is based on the impossibility of an eavesdropper to clone a message without destroying it. As such the receiver has the possibility to detect eavesdropping and this is a major advantage of this type of protocols. In the end a security proof will be described.