  As the method to completely characterize quantum dynamical processes, quantum
process tomography (QPT) is vitally important for quantum information
processing and quantum control, where the faithfulness of quantum devices plays
an essential role. Here via weak measurements, we present a new QPT scheme
characterized by its directness and parallelism. Comparing with the existing
schemes, our scheme needs a simpler state preparation and much fewer
experimental setups. Furthermore, each parameter of the quantum process is
directly determined from only five experimental values in our scheme, meaning
that our scheme is robust against the accumulation of errors.
