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Quantum Physics

arXiv:2508.20454 (quant-ph)
[Submitted on 28 Aug 2025]

Title:Modulation Instability-Induced Multimode Squeezing in Quadratic Frequency Combs

Authors:Haodong Xu, Nianqin Li, Zijun Shu, Yang Shen, Bo Ji, Aiping Xie, Feng Yang, Dengcai Yang, Jing Peng, Hang Gong, Guoxiang Huang, Chunbo Zhao, Wei Li, Tengfei Wu, Guangqiang He
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Abstract:Lithium niobate (LN) microring resonators, characterized by an exceptionally high second-order nonlinear coefficient and superior electro-optic tunability, serve as an outstanding platform for the precise control of integrated quantum frequency combs (QFCs). In this study, we introduce a bipartite entanglement criterion to investigate the pairwise entanglement characteristics of QFCs generated via the spontaneous parametric down-conversion (SPDC) process in lithium niobate microring resonators operating below threshold. Furthermore, we propose a universal framework for analyzing multimode squeezing in quadratic frequency combs, enabling the realization of ultrabroadband and high-degree multimode squeezing. We further reveal the underlying physical mechanism: modulation instability (MI), regulated by temporal walk-off control, not only enables the formation of frequency combs but also induces multimode squeezing in the corresponding resonant modes. This study uncovers the previously unexplored role of on-chip multimode squeezing in quadratic frequency combs while facilitating collective noise suppression across multiple modes, thus holding substantial potential for advancing quantum precision measurement and quantum information processing.
Subjects: Quantum Physics (quant-ph)
Cite as: arXiv:2508.20454 [quant-ph]
  (or arXiv:2508.20454v1 [quant-ph] for this version)
  https://doi.org/10.48550/arXiv.2508.20454

Submission history

From: He Guangqiang [view email]
[v1] Thu, 28 Aug 2025 06:00:27 UTC (6,448 KB)
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