  Weak measurement has provided new insight into the nature of quantum
measurement, by demonstrating the ability to extract average state information
without fully projecting the system. For single qubit measurements, this
partial projection has been demonstrated with violations of the Leggett-Garg
inequality. Here we investigate the effects of weak measurement on a maximally
entangled Bell state through application of the Hybrid Bell-Leggett-Garg
inequality (BLGI) on a linear chain of four transmon qubits. By correlating the
results of weak ancilla measurements with subsequent projective readout, we
achieve a violation of the BLGI with 27 standard deviations of certainty.
