Fig. 1
From: Steering is an essential feature of non-locality in quantum theory
The uncertainty principle illustrated by randomly oriented polarizers. Input state \(\left| \psi \right\rangle\) is prepared via a polarizer (Pol) oriented at ϕ/2, (which corresponds to orientation ϕ on the Bloch sphere). A reflecting mirror M1 is randomly inserted with probability 0 < p < 1 in the path of the photons. A polarizer at 0 measures observable Q(0), and another one rotated by \({\textstyle{\theta \over 2}}\) (0 < θ < π) measures Q(θ), such that probability that a photon is transmitted, is P(transmission) = \((1 - p)Q(0)_{\left| \psi \right\rangle }\) + \(pQ(\theta )_{\left| \psi \right\rangle }\) and it is upper bounded by ξ(θ, p)
