Generating entangled photon pairs in thin film lithium niobate for quantum communication

Guhwan Kim; Tetiana V. Slusar; Hong-Seok Kim; Jinwoo Kim; Jiho Park; Jin Tae Kim; Jaegyu Park; Kiwon Moon; Myung-Hyun Lee; Jung Jin Ju

doi:10.1117/12.3002070

13 March 2024 Generating entangled photon pairs in thin film lithium niobate for quantum communication

Guhwan Kim, Tetiana V. Slusar, Hong-Seok Kim, Jinwoo Kim, Jiho Park, Jin Tae Kim, Jaegyu Park, Kiwon Moon, Myung-Hyun Lee, Jung Jin Ju

Author Affiliations +

Proceedings Volume PC12889, Integrated Optics: Devices, Materials, and Technologies XXVIII; PC128890G (2024) https://doi.org/10.1117/12.3002070
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Spontaneous parametric down conversion in nonlinear material is widely exploited to generate entangled photon pairs in quantum optics experiments and applications, including quantum computing and communication. Periodically poled thin film lithium niobate (PPTFLN) has emerged as a promising platform for efficient entangled photon pair generation, offering enhanced nonlinear interaction through quasi-phase matching (QPM) and tight confinement of light. However, achieving optimal performance requires careful control of the QPM condition since the waveguide in TFLN is highly dispersive to changes in the geometric parameter. In this study, we fabricate PPTFLN rib waveguides to generate entangled photon pairs at telecommunication wavelengths, varying geometric parameters. QPM condition is confirmed with the second harmonic generation experiments and Pair generation rate and coincidence-to-accidental count ratio are also estimated by temporal coincidence measurement. Digital etching process is introduced to control the QPM condition, resulting in incremental peak wavelength shift by discrete etching step. This is expected to contribute to synchronizing wavelength of quantum nodes.

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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Guhwan Kim, Tetiana V. Slusar, Hong-Seok Kim, Jinwoo Kim, Jiho Park, Jin Tae Kim, Jaegyu Park, Kiwon Moon, Myung-Hyun Lee, and Jung Jin Ju "Generating entangled photon pairs in thin film lithium niobate for quantum communication", Proc. SPIE PC12889, Integrated Optics: Devices, Materials, and Technologies XXVIII, PC128890G (13 March 2024); https://doi.org/10.1117/12.3002070

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KEYWORDS

Quantum entanglement

Harmonic generation

Lithium niobate

Thin films

Quantum communications

Second harmonic generation

Quantum light generation

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