  The problem of noise incidence on qubits taking part of bipartite
entanglement-based protocols is addressed. It is shown that the use of a
three-partite GHZ state and measurements instead of their EPR counterparts
allows the experimenter to detect $2/3$ of the times whenever one of the qubits
involved in the measurement is affected by bit-flip noise through the mere
observation of unexpected outcomes in the teleportation and superdense coding
protocols when compared to the ideal case. It is shown that the use of
post-selection after the detection of noise leads to an enhancement in the
efficiency of the protocols. The idea is extended to any protocol using
entangled states and measurements. Furthermore it is provided a generalization
in which GHZ states and measurements with an arbitrary amount of qubits are
used instead of EPR pairs, and remarkably, it is concluded that the optimal
number of qubits is only three.
