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 E-Mail IMAGE: An observer (Wigner s friend) performs a quantum measurement on a spin system. Later, Wigner measures the friend and spin in an entangled basis. As a consequence of this measurement, not. view more  Credit: © Aloop, IQOQI-Wien, Österreichische Akademie der Wissenschaften In 1961, the Nobel prize winning theoretical physicist Eugene Wigner proposed what is now known as the Wigner s friend thought experiment as an extension of the notorious Schroedinger s cat experiment. In the latter, a cat is trapped in a box with poison that will be released if a radioactive atom decays. Governed by quantum mechanical laws, the radioactive atom is in a superposition between decaying and not decaying, which also means that the cat is in a superposition between life and death. What does the cat experience when it is in the superposition? Wigner sharpened the question by pushing quantum theory to its conceptual limits. He investigated what happens when an observer also ha

Caslav bruknerEugene wignerPhilippe allard guPerimeter institute for theoretical physicsInstitute of quantum opticsCommunications physicsAustrian academy of sciencesUniversity of viennaQuantum opticsQuantum informationAustrian academyPerimeter instituteTheoretical physicsChemistry physics materials sciencesMathematics statisticsTechnology engineering computer science