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The radiative recombination of Cooper pairs was demonstrated, using a Nb/n-InGaAs/p-InP heterostructure [EL_Hayashi, PL_Hayashi], called Cooper pair LED [PL_Suemune, R_Suemune]. It has been suggested that the junction could produce entangled photon pairs [Benson, Gywat] needed for quantum information processing and communication. 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