Towards on-chip photon-pair bell tests: Spatial pump filtering in a LiNbO3adiabatic coupler

Solntsev, A, Liu, T, Boes, A, Nguyen, G, Wu, C, Setzpfandt, F, Mitchell, A, Neshev, D and Sukhorukov, A 2017, 'Towards on-chip photon-pair bell tests: Spatial pump filtering in a LiNbO3adiabatic coupler', Applied Physics Letters, vol. 111, no. 26, pp. 1-5.


Document type: Journal Article
Collection: Journal Articles

Title Towards on-chip photon-pair bell tests: Spatial pump filtering in a LiNbO3adiabatic coupler
Author(s) Solntsev, A
Liu, T
Boes, A
Nguyen, G
Wu, C
Setzpfandt, F
Mitchell, A
Neshev, D
Sukhorukov, A
Year 2017
Journal name Applied Physics Letters
Volume number 111
Issue number 26
Start page 1
End page 5
Total pages 5
Publisher A I P Publishing LLC
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.
Subject Physical Sciences not elsewhere classified
Quantum Optics
DOI - identifier 10.1063/1.5008445
Copyright notice © 2017 Author(s).
ISSN 0003-6951
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