Journal article

Whole-Device Entanglement in a 65-Qubit Superconducting Quantum Computer

Gary J Mooney, Gregory AL White, Charles D Hill, Lloyd CL Hollenberg



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, the extent to which entangled quantum states over large numbers of qubits can be prepared on current superconducting quantum devices is investigated. Native-graph states on the IBM Quantum 65-qubit ibmq_manhattan device and the 53-qubit ibmq_rochester device are prepared and quantum readout-error mitigation (QREM) is applied. Connected entanglement graphs spanning each of the full devices are detected, indicating bipartite entanglement over the whole of each device. The application of QREM is shown to incre..

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Funding Acknowledgements

This work was supported by the University of Melbourne through the establishment of an IBM Quantum Network Hub at the University. C.D.H. is supported by a research grant from the Laby Foundation. The authors would like to thank Howard Bondell for valuable discussions on aspects of the statistical analysis.