  The ability to generate large-scale entanglement is an important progenitor
of quantum information processing capability in noisy intermediate-scale
quantum (NISQ) devices. In this paper, we investigate the extent to which
entangled quantum states over large numbers of qubits can be prepared on
current superconducting quantum devices. We prepared native graph states on the
IBM Quantum 65-qubit $\textit{ibmq_manhattan}$ device and the 53-qubit
$\textit{ibmq_rochester}$ device and applied quantum readout-error mitigation
(QREM). Connected entanglement graphs spanning each of the full devices were
detected, indicating whole-device entanglement in both devices. The application
of QREM was shown to increase the observed entanglement within all
measurements, in particular, the detected number of entangled pairs of qubits
found within $\textit{ibmq_rochester}$ increased from 31 to 56 of the total 58
connected pairs. The results of this work indicate full entanglement in two of
the largest superconducting devices to date.
