  Quantum effects in photosynthetic energy transport in nature, especially for
the typical Fenna-Matthews-Olson (FMO) complexes, are extensively studied in
quantum biology. Such energy transport processes can be investigated as open
quantum systems that blend the quantum coherence and environmental noises, and
have been experimentally simulated on a few quantum devices. However, the
existing experiments always lack a solid quantum simulation for the FMO energy
transport due to their constraints to map a variety of issues in actual FMO
complexes that have rich biological meanings. Here we successfully map the full
coupling profile of the seven-site FMO structure by comprehensive
characterization and precise control of the evanescent coupling of the
three-dimensional waveguide array. By applying a stochastic dynamical
modulation on each waveguide, we introduce the base site energy and the
dephasing term in colored noises to faithfully simulate the power spectral
density of the FMO complexes. We show our photonic model well interprets the
issues including the reorganization energy, vibrational assistance, exciton
transfer and energy localization. We further experimentally demonstrate the
existence of an optimal transport efficiency at certain dephasing strength,
providing a window to closely investigate environment-assisted quantum
transport.
