Recommended by us: Violation of the "first" Heisenberg's Uncertainty Principle

“ Synopsis: The Certainty of Uncertainty L. A. Rozema et al. Phys. Rev. Lett. (2012) Violation of Heisenberg’s Measurement-Distrurbance                                           Relationship by Weak Measurements Lee A. Rozema, Ardavan Darabi, Dylan H. Mahler, Alex Hayat,                                   Yasaman Soudagar, and Aephraim M. Steinberg Phys. Rev. Lett. 109, 100404 (2012) Published September 6, 2012 When first taking quantum mechanics courses, students learn about Heisenberg’s uncertainty principle, which is often presented as a statement about the intrinsic uncertainty that a quantum system must possess. Yet Heisenberg originally formulated his principle in terms of the “observer effect”: a relationship between the precision of a measurement and the disturbance it creates, as when a photon measures an electron’s position. Although the former version is rigorously proven, the latter is less general and—as recently shown—mathematically incorrect. In a paper in Physical Review Letters, Lee Rozema and colleagues at the University of Toronto, Canada, experimentally demonstrate that a measurement can in fact violate Heisenberg’s original precision-disturbance relationship. (Continue to read on physics.aps.org)

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