  The high internal quantum efficiency observed in higher plants remains an
outstanding problem in understanding photosynthesis. Several approaches such as
quantum entanglement and quantum coherence have been explored. However, none
has yet drawn an analogy between superlattices and the geometrical structure of
granal thylakoids in leaves. In this paper, we calculate the transmission
coefficients and perform numerical simulations using the parameters relevant to
a stack of thylakoid discs. We then show that quantum resonant tunneling can
occur at low effective mass of particles for 680 nm and 700 nm incident
wavelengths corresponding to energies at which photosynthesis occurs.
