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13 December 2024 Integrated spatially multiplexed single-photon sources in a bidirectionally pumped spiral waveguide
Fanjie Ruan, Haoran Ma, Li’ao Ye, DongHui Chen, Denghui Wang, Yuehai Wang, Jianyi Yang
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Proceedings Volume 13499, AOPC 2024: Optical Devices and Integration; 134990V (2024) https://doi.org/10.1117/12.3048112
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China
Abstract
Silicon-based integrated spiral waveguides are extensively used as on-chip single-photon sources. However, inherent uncertainties and limitations in single-photon fidelity pose significant theoretical performance bottlenecks. These challenges often necessitate the multiplexing of multiple sources. In this paper, we propose a novel scheme for spatial multiplexing using bidirectional spirals. By pumping a spiral waveguide bidirectionally, photon pairs are generated in both clockwise (cw) and counterclockwise (ccw) directions, each producing signal-idler photon pairs in a two-mode squeezed state. Consequently, a single spiral waveguide can function as two spatially multiplexed sources. Using CMOS fabrication technology, we constructed a bidirectional spiral waveguide structure. We measured the coincidence count rates, heralded second-order correlation function, and coincidence to accidental ratio (CAR) as functions of pump power, both before and after multiplexing. Our experimental results demonstrated a 1.67-fold increase in performance post-multiplexing. This finding underscores the potential of bidirectional spirals as spatially multiplexed sources, paving the way for the largescale integration of future photonic quantum chips.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
Citation Download Citation
Fanjie Ruan, Haoran Ma, Li’ao Ye, DongHui Chen, Denghui Wang, Yuehai Wang, and Jianyi Yang "Integrated spatially multiplexed single-photon sources in a bidirectionally pumped spiral waveguide", Proc. SPIE 13499, AOPC 2024: Optical Devices and Integration, 134990V (13 December 2024); https://doi.org/10.1117/12.3048112
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KEYWORDS
Multiplexing
Waveguides
Quantum detection
Optical switching
Dense wavelength division multiplexing
Quantum optics experiments
Quantum signals
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