Is coherent light immune to incoherent light because they are both light waves?

Is coherent light immune to incoherent light (triggering decoherence) because they are both in a quantum light wave form at the time?

Are all other types of quantum waves susceptible to this overwhelming cause of decoherence?

Does superposition, entanglement, or tunneling function if the wave they are made of is not coherent?

Does a Bose–Einstein condensate work because the lasers are using the, quantum-wave-friendly, coherent beams?