Towards on-chip photon-pair bell tests: Spatial pump filtering in a LiNbO3 adiabatic coupler

Alexander S. Solntsev, Tong Liu, Andreas Boes, Thach G. Nguyen, Che Wen Wu, Frank Setzpfandt, Arnan Mitchell, Dragomir N. Neshev, Andrey A. Sukhorukov

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    6 Citations (Scopus)

    Abstract

    Nonlinear optical waveguides enable the integration of entangled photon sources and quantum logic gates on a quantum photonic chip. One of the major challenges in such systems is separating the generated entangled photons from the pump laser light. In this work, we experimentally characterize double-N-shaped nonlinear optical adiabatic couplers designed for the generation of spatially entangled photon pairs through spontaneous parametric down-conversion, while simultaneously providing spatial pump filtering and keeping photon-pair states pure. We observe that the pump photons at a wavelength of 671 nm mostly remain in the central waveguide, achieving a filtering ratio of over 20 dB at the outer waveguides. We also perform classical characterization at the photon-pair wavelength of 1342 nm and observe that light fully couples from an input central waveguide to the outer waveguides, showing on chip separation of the pump and the photon-pair wavelength.

    Original languageEnglish
    Article number261108
    JournalApplied Physics Letters
    Volume111
    Issue number26
    DOIs
    Publication statusPublished - 25 Dec 2017

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