Curator's Take
This groundbreaking experiment demonstrates Bell nonlocality in an unprecedented regime, simultaneously achieving high-dimensional correlations (64 dimensions) and many-body entanglement across 12 qubits on a superconducting quantum processor. What makes this particularly remarkable is that the researchers observed genuinely collective nonlocal behavior where all qubits contribute to the violation, even though individual qubit pairs appear classically correlated - a counterintuitive quantum phenomenon that was previously beyond experimental reach. The work elegantly bridges fundamental quantum mechanics research with practical quantum computing benchmarking, showing how exploring exotic quantum correlations can serve as a rigorous test of current hardware capabilities. This achievement opens new avenues for probing quantum foundations while potentially informing the development of quantum algorithms that leverage high-dimensional entanglement for computational advantage.
— Mark Eatherly
Summary
Combining recent advances in superconducting quantum hardware, we explore quantum correlations in a previously inaccessible regime by observing \emph{simultaneously} high-dimensional and many-body Bell non-locality. We report a high-confidence Bell violation in the correlations between two $d=64$-dimensional systems encoded in twelve qubits. For system sizes up to $d=32$, the strength of the observed nonlocal correlations exceeds the quantum upper bound for $d=2$ systems, providing direct evidence of high-dimensional nonlocality. Furthermore, we demonstrate that the observed violation is genuinely collective: all qubits contribute to the nonlocal correlations, while most pairwise correlations across the bipartition remain Bell-local. Our work illustrates how present-day quantum processors enable the exploration of fundamental predictions of quantum mechanics in previously inaccessible regimes and, in turn, how fundamental quantum effects can be used to benchmark their performance.