Loophole-free Bell inequality violation using electron spins separatedn by 1.3 kilometres

摘要

More than 50 years ago(1), John Bell proved that no theory of nature that obeys locality and realism(2) can reproduce all the predictions of quantum theory: in any local-realist theory, the correlations between outcomes of measurements on distant particles satisfy an inequality that can be violated if the particles are entangled. Numerous Bell inequality tests have been reported(3-13); however, all experiments reported so far required additional assumptions to obtain a contradiction with local r