(color online) (a) Sketch of the six-legged strain tuning device used to engineer a nanomembrane (grey region) containing QDs. (b) Entanglement fidelity with (blue data points) and without (red data points) the Cs cell in the exciton optical path.^[80] (c) Scheme of the cross section of the four-legged strain-tuning device. A focused ion beam (FIB) and a wet-chemical undercut were used to fabricate the device. A thin GaAs nanomembrane containing In(Ga)As QDs was transferred to the suspended region between the four legs.^[83] (d) Entanglement fidelity results after the FSS tuning, without any background subtraction.