Playing Quantum Nonlocal Games with Six Noisy Qubits on the Cloud

Nonlocal games are extensions of Bell inequalities, aimed at demonstrating quantum advantage. These well suited for noisy computers because they only require the preparation a shallow circuit, followed by measurement non-commuting observable. Here, minimal implementation nonlocal game proposed in Science 362, 308 (2018) is considered. This tested preparing 6-qubit cluster state using on cloud IBM, IonQ, and Honeywell. The present includes several levels optimization, such as circuit identities error mitigation, allows us to cross classical threshold demonstrate advantage one computer. nature further studied inequality that observe less accurate computers, expense probing larger number circuits.