  Environmental noise and disorder play critical roles in quantum particle and
wave transport in complex media, including solid-state and biological systems.
Recent work has predicted that coupling between noisy environments and
disordered systems, in which coherent transport has been arrested due to
localization effects, could actually enhance transport. Photonic integrated
circuits are promising platforms for studying such effects, with a central goal
being the development of large systems providing low-loss, high-fidelity
control over all parameters of the transport problem. Here, we fully map the
role of disorder in quantum transport using a nanophotonic processor consisting
of a mesh of 88 generalized beamsplitters programmable on microsecond
timescales. Over 64,400 transport experiments, we observe several distinct
transport regimes, including environment-assisted quantum transport and the
''quantum Goldilocks'' regime in strong, statically disordered discrete-time
systems. Low loss and high-fidelity programmable transformations make this
nanophotonic processor a promising platform for many-boson quantum simulation
experiments.
