Addendum to "Experimental demonstration of a quantum protocol for Byzantine agreement and liar detection" arXiv:0710.0290

Sascha Gaertner, Mohamed Bourennane, Christian Kurtsiefer, Adan Cabello, Harald Weinfurter

Published 2008-10-21, updated 2008-11-16Version 3

Gao et al. [Phys. Rev. Lett. 101, 208901 (2008)] have described a possible intercept-resend attack for the quantum protocol for detectable Byzantine agreement in Phys. Rev. Lett. 100, 070504 (2008). Here we describe an extension of the protocol which defeats such attacks.