  We study the influence of an external driving field on the coherence
properties of a qubit under the influence of bit-flip noise. In the presence of
driving, two paradigmatic cases are considered: (i) a field that results for a
suitable choice of the parameters in so-called coherent destruction of
tunneling and (ii) one that commutes with the static qubit Hamiltonian. In each
case, we give for high-frequency driving a lower bound for the coherence time.
This reveals the conditions under which the external fields can be used for
coherence stabilization.
