Entangled photons cast a new light on cause and effect

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The idea that correlation does not imply causation is well known to scientists and statisticians, but now physicists in Canada have shown that it is not always the case in the weird world of quantum mechanics. Research in medicine, economics and many other disciplines often relies on showing a statistical correlation between two variables. It is often not clear, however, … Read More

Connecting the Classical and Quantum

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How does a classical temperature form in the quantum world? An experiment at the Vienna University of Technology has directly observed the emergence and the spreading of a temperature in a quantum system. Remarkably, the quantum properties are lost, even though the quantum system is completely isolated and not connected to the outside world. The experimental results are being published … Read More