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";s:4:"text";s:2938:"Your opinions are important to us. Quantum mechanics can violate the inequality, whereas local realism cannot. In 1927, Einstein didn’t believe it, but Quantum Theory explained the phenomenon of “spooky action at a distance”. They each make a choice which physical property they want to measure, e.g. The beam starts in the lower left, splits in the middle, and the left “arm” goes through phase filters. Similarly, in the "freedom-of-choice" loophole the measurement choices of Alice and Bob are considered to be influenced by the local realistic properties of the particle pairs. The team produced photons with an ultraviolet laser, passing them through a crystal that causes some of the photos to become entangled. Closing the loopholes was made possible by recent technical advances, including NIST's ultrafast single-photon detectors, which can accurately detect at least 90 percent of very weak signals, and new tools for randomly picking detector settings.

The experiment was conducted at NIST's Boulder, Colo., campus, where researchers made one of the photon detectors and provided theoretical support. The NIST experiments are called Bell tests, so named because in 1964 Irish physicist John Bell showed there are limits to measurement correlations that can be ascribed to local, pre-existing (i.e. From every pair, one photon is sent to a party usually called Alice, and the other photon is sent to Bob. There, individual quantum particles are the carriers of information and the entanglement between them promises absolutely secure communication as well as enhanced computation power compared to any conceivable classical technology.
You can be assured our editors closely monitor every feedback sent and will take appropriate actions. In a Bell test, pairs of particles, e.g. One of the strangest features of physics is quantum entanglement, and scientists from the University of Glasgow have just captured the first photo demonstrating the effect. However, it showed the same phase transitions as its partner. In the last decades, Bell's inequality has been violated in numerous experiments and for several different physical systems such as photons or atoms. However, about two decades ago, the physicist Philippe Eberhard from the Lawrence Berkeley Laboratory (USA) proposed a new form of the inequality that explicitly includes also undetected events and requires an efficiency of only two thirds. Einstein famously called entanglement “spooky action at a distance.” Einstein felt the existence of entanglement meant there were gaping holes in quantum mechanical theory. The University of Glasgow experiment may open the door to new types of imaging that help us come to grips with that spooky action at a distance. (Think of randomly flipping many fair coins, where those coins with heads up tend to hide and thus have a smaller probability of being observed than the ones with tails up.
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