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We study the diffraction of two maximally entangled qubits encoded intospatial modes of light with orbital angular momenta $\pm \hbar l_0$, on angularapertures. Exploiting the uncertainty relation between angular position andmomentum, we quantify the diffraction-induced entanglement loss, for different$l_0$, as a function of the angular uncertainty $\Delta \phi$ induced by theapertures. We demonstrate that the degradation of entanglement follows auniversal law parametrised by the product $l_0\Delta \phi$ alone.} {We studythe diffraction of two photonic qubits, which are initially maximally entangledin their orbital angular momenta, on angular apertures. Using the uncertaintyrelation between angular position and momentum, we show that thediffraction-induced entanglement losses exhibit universal behaviour.

Universal entanglement losses induced by angular uncertainty