16-qubit IBM universal quantum computer can be fully entangled

Abstract

Entanglement is an important evidence that a quantum device can potentially solve problems intractable for classical computers. In this paper, we prepare connected graph states involving 8 to 16 qubits on ibmqx5, a 16-qubit superconducting quantum processor accessible via IBM cloud,using low-depth circuits. We demonstrate that the prepared state is fully entangled, i.e. the state is inseparable with respect to any fixed partition.

23 pages, 9 figures, 2 tables; The full entanglement is clarified; a new section is added on the localized entanglement with distance 3 and 4, accepted version

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