“First Loophole-Free Bell Experiment Confirms True Quantum Correlations”

The Bell inequality has helped shed light on the structure of correlations allowed by quantum mechanics and what this theory of physics says about the world. Experimental verification of the Bell inequality is also of practical importance, as it allows confirmation of the existence of true quantum correlations for communication and computation. To ensure security, these verifications need to be done in a “loophole-free” manner, which is required experimentally. S Storz and colleagues now report the results of the first loophole-free bell experiment using a superconducting qubit 30 m away. This verification required the development of a large-scale cryogenic system to maintain each qubit and its connections at milli-Kelvin temperatures.

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