We model a superconducting p-n junction in which the n- and the p-sides arecontacted through two optical quantum dots (QDs), each embedded into a photonicnanocavity. Whenever a Cooper pair is transferred from the n-side to thep-side, two photons are emitted. When the two electrons of a Cooper pair aretransported through different QDs, polarization-entangled photons are created,provided that the Cooper pairs retain their spin singlet character while beingspatially separated on the two QDs. We show that a CHSH Bell-type measurementis able to detect the entanglement of the photons over a broad range ofmicroscopic parameters, even in the presence of parasitic processes andimperfections.
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