In 1935, Einstein asked a profound question about our understanding of Nature: are objects only influenced by their nearby environment? Or could, as predicted by quantum theory, looking at one object sometimes instantaneously affect another far-away object? We tried to answer that question, by performing a loophole-free Bell test.
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Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres B. Hensen, H. Bernien, A.E. Drau, A. Reiserer, N. Kalb, M.S. Blok, J. Ruitenberg, R.F.L. Vermeulen, R.N. Schouten, C. Abelln, W. Amaya, V. Pruneri, M. W. Mitchell, M. Markham, D.J. Twitchen, D. Elkouss, S. Wehner, T.H. Taminiau, R. Hanson Nature, published online October 21, 2015.
DOI: 10.1038/nature.15759 link to online article
In this animation, a short overview of the concepts and history of the Bell test is given, and how our experimental result fits in the story.
This animation explains how the Bell test works.
Part of the Bell test setup, at location A. This image shows the experimental setup that houses the diamonds used in the Bell test. The diamonds are hosted in a low-temperature microscope, that can be seen on the far left of the image. Photo: Frank Auperle.
Aerial view of the campus, with location of the labs highlighted. On the far left is location A, housing one of the two diamonds. The other diamond is housed on the other end of the campus, on the right of the photo. The beam-spliter, at location C, is located in the middle. Aerial photograph: Slagboom en Peeters Luchtfotografie BV.