Wavelength-Tunable and High-Heralding-Efficiency Quantum Photon Source in Birefringent Phase-Matched Lithium Niobate Waveguide

• URL: http://arxiv.org/abs/2412.11371v1
• Date: Mon, 16 Dec 2024 01:58:39 GMT
• Title: Wavelength-Tunable and High-Heralding-Efficiency Quantum Photon Source in Birefringent Phase-Matched Lithium Niobate Waveguide
• Authors: Zhu-Qi Tao, Xiao-Xu Fang, He Lu,
• Abstract summary: Lithium niobate(LN) is a birefringent material, where the strong birefringence thermo-optic effect is promising for the generation of quantum photon source. We demonstrate birefringent phase-matching in a 20-mm-long waveguide fabricated on 5$mu$m-thick x-cut lithium niobate on insulator.
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• Abstract: Lithium niobate~(LN) is a birefringent material, where the strong birefringence thermo-optic effect is promising for the generation of quantum photon source with widely tunable wavelength. Here, we demonstrate birefringent phase-matching in a 20-mm-long waveguide fabricated on 5~$\mu$m-thick x-cut lithium niobate on insulator. The waveguide is deviated from the optical axis of LN by an angle of 53.5$^\circ$, enabling the phase matching between telecom and visible wavelengths. The phase-matching wavelength of this device can be thermally tuned with rate of 0.617~nm/K. We demonstrate the type-1 spontaneous parametric down-conversion to generate photon pairs with brightness of 2.2~MHz/mW and coincidence-to-accidental ratio up to $2.8\times10^5$. Furthermore, the heralded single photon is obtained from the photon pair with efficiency of 13.8\% and count rate up to 37.8~kHz.

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