The experimental team at ETH Zürich has implemented a loophole-free test of Bell’s inequality in a superconducting setup. To achieve this breakthrough, the researchers created pairs of entangled qubits across a 30m long superconducting quantum link. In this way, any mutual influence of the measurements performed on both sides of the link could be ruled out by the finite speed of light and the existence of non-local quantum correlations could be confirmed for the first time with macroscopic superconducting circuits. This study has just been published in Nature.
