title: High efficiency coupling of photon pairs in practice.
abstract: Multi-photon and quantum communication experiments such as loophole-free Bell tests and device independent quantum key distribution require entangled photon sources which display high coupling efficiency. In this paper we put forward a simple quantum theoretical model which allows the experimenter to design a source with high pair coupling efficiency. In particular we apply this approach to a situation where high coupling has not been previously obtained: we demonstrate a symmetric coupling efficiency of more than 80% in a highly frequency non-degenerate configuration. Furthermore, we demonstrate this technique in a broad range of configurations, i.e. in continuous wave and pulsed pump regimes, and for different nonlinear crystals.
authors: T
authors: T
authors: Guerreiro
authors: A
authors: A
authors: Martin
authors: B
authors: B
authors: Sanguinetti
authors: N
authors: N
authors: Bruno
authors: H
authors: H
authors: Zbinden
authors: R T
authors: RT
authors: Thew