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

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...

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Veröffentlicht in:Applied physics letters 2017-12, Vol.111 (26)
Hauptverfasser: Solntsev, Alexander S., Liu, Tong, Boes, Andreas, Nguyen, Thach G., Wu, Che Wen, Setzpfandt, Frank, Mitchell, Arnan, Neshev, Dragomir N., Sukhorukov, Andrey A.
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Sprache:eng
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Zusammenfassung: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5008445