Figure 3
From: Experimental violation and reformulation of the Heisenberg's error-disturbance uncertainty relation
Experimental setup to test the error-disturbance relation.
ND (neutral density filter), Pol. (vertical polarizer) and WP (wave plates) prepare the initial polarization qubit |ψ〉. Pol. or HWP is inserted to prepare Z|ψ〉, (Z + I)|ψ〉, X|ψ〉 and (X + I)|ψ〉. VBS(t,r) is realized by using a pair of HWPs and a PBS. A HWP at an angle of 22.5° and a PBS are used to carry out the projective measurement of X.
