In 1927, Niels Bohr introduced complementarity to quantum mechanics. A pair of complementary properties cannot be observed or measured simultaneously, he asserted. Finding the concept unpalatable, Albert Einstein promptly devised a thought experiment to expose what he believed was complementarity’s contradictory character. Now Jian-Wei Pan of the University of Science and Technology of China (USTC) and his collaborators have performed Einstein’s experiment in their lab [1]. Their realization is not the first, nor was its vindication of complementarity needed. However, the USTC setup has the potential to explore other, less established aspects of quantum mechanics.
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