A two-channel, spectrally degenerate polarization entangled source on chip

Abstract

Quantum Information: the realization of integrated entangled photons sources In the context of quantum technology, integrated photonic devices demonstrated great potential to perform quantum tasks stably with ease. Despite the great development of integrated circuits, the generation of quantum states of light remains challenging in an integrated geometry. In particular, one of the most adopted source in quantum information processes, the one firstly proposed by Kwiat et al. (PRL 75, 4337 1995) which provides polarization entangled photons at the same wavelength, was still not available on an integrated platform. Christine Silberhorn and co-workers from the University of Paderborn (Germany), overcome the previous technological issues and realized such a quantum source. With this achievement the Authors provide a device that performs better than the corresponding bulk schemes and is an optimal candidate to be exploited with integrated linear circuit for a full generation and manipulation of polarization encoded qubits in integrated platforms.