Superconducting qubits defy Einstein's local causality concept.

Researchers at ETH Zurich have performed a loophole-free Bell test using superconducting circuits, further disproving Albert Einstein's concept of local causality and providing confirmation for quantum mechanics. The experiment also confirms that superconducting circuits operate according to the laws of quantum mechanics and opens up possibilities for practical applications in cryptography and distributed quantum computing. The researchers built an impressive facility containing a 30-meter-long vacuum tube connecting two cryostats containing superconducting circuits, which were entangled and subjected to random measurements to violate Bell's inequality.