Uncertainty from Heisenberg to Today

Abstract

We explore the different meanings of "quantum uncertainty" contained in Heisenberg's seminal paper from 1927, and also some of the precise definitions that were explored later. We recount the controversy about "Anschaulichkeit", visualizability of the theory, which Heisenberg claims to resolve. Moreover, we consider Heisenberg's programme of operational analysis of concepts, in which he sees himself as following Einstein. Heisenberg's work is marked by the tensions between semiclassical arguments and the emerging modern quantum theory, between intuition and rigour, and between shaky arguments and overarching claims. Nevertheless, the main message can be taken into the new quantum theory, and can be brought into the form of general theorems. They come in two kinds, not distinguished by Heisenberg. These are, on one hand, constraints on preparations, like the usual textbook uncertainty relation, and, on the other, constraints on joint measurability, including trade-offs between accuracy and disturbance.

arXiv comment36 pages, 1 figure

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• Covariant Space Time Line Elements in the Friedmann Lemaitre Robertson Walker Geometry
• Entropic measurement uncertainty relations for all the infinite components of a spin vector
• Quantum Mechanics: Statistical Balance Prompts Caution in Assessing Conceptual Implications
• Einstein's photon box revisited