Generalizations of Heisenberg uncertainty relation

Abstract

A survey on the generalizations of Heisenberg uncertainty relation and a general scheme for their entangled extensions to several states and observables is presented. The scheme is illustrated on the examples of one and two states and canonical quantum observables, and spin and quasi-spin components. Several new uncertainty relations are displayed. PACS 0365H, 4250D, 0220.Comment: latex, 7 pages, no figures. Dedicated to the 100 anniversary of W. Heisenberg (born Dec 5, 1901); v.2: some typos corrected. A short paragraph and one reference added. To appear in Eur. Phys.