Most readers will have heard of Heisenberg’s uncertainty principle. According to this principle, it is not possible to measure (i.e. to magnify to the classical level) both the position and the momentum of a particle accurately at the same time. Worse than this, there is an absolute limit on the product of these accuracies, say Δx and Δp, respectively, which is given by the relation Δx Δp ≥ℏ.
