Superconducting qubits disprove Einstein's theory of local causality.
An experiment using superconducting qubits separated by 30 meters has demonstrated that quantum mechanics violates local realism by allowing two objects to behave as a single quantum system, no matter how large the separation between them. The experiment provides a new precision to these sorts of measurements and may be essential for future quantum computing efforts. The experiment is interesting because qubits give us a great deal of control over the system, allowing us to rapidly perform a large number of experiments and probe the behavior of this entanglement.
