Polarization-entangled quantum frequency comb from a silicon nitride microring resonator

• URL: http://arxiv.org/abs/2309.01181v2
• Date: Thu, 18 Apr 2024 01:09:48 GMT
• Title: Polarization-entangled quantum frequency comb from a silicon nitride microring resonator
• Authors: Wenjun Wen, Wenhan Yan, Chi Lu, Liangliang Lu, Xiaoyu Wu, Yanqing Lu, Shining Zhu, Xiao-song Ma,
• Abstract summary: Integrated microresonator facilitates the realization of quantum frequency comb (QFC) We demonstrate a broadband polarization-entangled quantum frequency comb by combining an integrated silicon nitride micro-resonator with a Sagnac interferometer.
• Score: 4.362206201471596
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Integrated microresonator facilitates the realization of quantum frequency comb (QFC), which provides a large number of discrete frequency modes with broadband spectral range and narrow linewidth. However, all previous demonstrations have focused on the generation of energy-time or time-bin entangled photons from QFC. Realizing polarization-entangled quantum frequency comb, which is the important resource for fundamental study of quantum mechanics and quantum information applications, remains challenging. Here, we demonstrate, for the first time, a broadband polarization-entangled quantum frequency comb by combining an integrated silicon nitride micro-resonator with a Sagnac interferometer. With a free spectral range of about 99 GHz and a narrow linewidth of about 190 MHz, our source provides 22 polarization entangled photons pairs with frequency covering the whole telecom C-band. The entanglement fidelities for all 22 pairs are above 81%, including 17 pairs with fidelities higher than 90%. Our demonstration paves the way for employing the polarization-entangled quantum frequency comb in quantum network using CMOS technology as well as standard dense wavelength division multiplexing technology.

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