  We propose an effective scheme for realizing a long-range quantum state
phase-covariant cloning between two qubits in fiber-nanocavity system via an
adiabatic passage. Since no cavity (fiber) photons or excited levels of the
nitrogen-vacancy (NV) center are populated during the whole process, the scheme
is immune to the decay of cavity (fiber) and spontaneous emission of the NV
center. The strictly numerical simulation shows that the fidelity is high even
in the presence of realistic imperfections.
