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) |
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| container_title | Applied physics letters |
| container_volume | 111 |
| creator | Solntsev, Alexander S. Liu, Tong Boes, Andreas Nguyen, Thach G. Wu, Che Wen Setzpfandt, Frank Mitchell, Arnan Neshev, Dragomir N. Sukhorukov, Andrey A. |
| description | 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. |
| doi_str_mv | 10.1063/1.5008445 |
| format | Article |
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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. 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| language | eng |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Adiabatic flow Applied physics Couplers Filtration Lithium niobates Logic circuits Optical waveguides Photonics Photons Quantum theory |
| title | Towards on-chip photon-pair bell tests: Spatial pump filtering in a LiNbO3 adiabatic coupler |
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