  The goal of quantum benchmarking is to certify that imperfect quantum
communication devices (e.g., quantum channels, quantum memories, quantum key
distribution systems) can still be used for meaningful quantum communication.
However, the test states used in quantum benchmarking experiments may be
imperfect as well. Many quantum benchmarks are only valid for states which
match some ideal form, such as pure states or Gaussian states. We outline how
to perform quantum benchmarking using arbitrary states of light. We demonstrate
these results using real data taken from a continuous-variable quantum memory.
