  In this work we extend a multi-qubit benchmarking technique known as the
Binned Output Generation (BOG) in order to discriminate between coherent and
incoherent noise sources in the multi-qubit regime. While methods exist to
discriminate coherent from incoherent noise at the single and few-qubit level,
these methods scale poorly beyond a few qubits or must make assumptions about
the form of the noise. On the other end of the spectrum, system-level
benchmarking techniques exist, but fail to discriminate between coherent and
incoherent noise sources. We experimentally verify the BOG against Randomized
Benchmarking (RB) (the industry standard benchmarking technique) in the
two-qubit regime, then apply this technique to a six qubit linear chain, a
regime currently inaccessible to RB. In this experiment we inject an
instantaneous coherent Z-type noise on each qubit and demonstrate that the
measured coherent noise scales correctly with the magnitude of the injected
noise, while the measured incoherent noise remains unchanged as expected. This
demonstrates a robust technique to measure coherent errors in a variety of
hardware.
