The entangled photons here are created by a laser that is sent to a crystal with special optical properties. A small portion of the laser light is transmitted to two cones of different polarization. Photons flying exactly along the two lines of intersection of the cones – in this cross section, the points of intersection of the circles – are entangled with each other.
Photo: IQOQI / Paul Kwiat and Michael Reck
The Nobel Committee honors experiments with astonishing philosophical results. How mandatory are they?
einstein was wrong. It is this result that earned John Closer, Alan Aspect and Anton Zeilinger this year’s Nobel Prize in Physics. Now before everyone gets confused, who regularly gets new affirmations of Albert Einstein Read Theory of Relativity: It’s not about that. It is about quantum theory.
Einstein did not want to believe in it—at least not in the form in which it was developed in the 1920s and mathematically codified into its foundations in the early 1930s—the foundations that also form the basis of later, later developments, until current efforts to generalize them to the theory of quantum gravity. And on these grounds, quantum theory is surprisingly successful: everything microscopic – particles, atoms, elementary particles – and also much that is microscopic, from lasers to superconductors, must be calculated with their equations, otherwise what is observed does not come out, or not exactly What is observed. But does this mean that the principles of quantum theory are correct?
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