  We analyze the steady-state energy transfer in a chain of coupled two-level
systems connecting two thermal reservoirs. Through an analytic treatment we
find that the energy current is independent of the system size, hence violating
Fourier's law of heat conduction. The classical diffusive behavior in Fourier's
law of heat conduction can be recovered by introducing decoherence to the
quantum systems constituting the chain. Implications of these results on energy
transfer in biological light harvesting systems, and the role of quantum
coherences and entanglement are discussed.
