Modulation Instability-Induced Multimode Squeezing in Quadratic Frequency Combs

• URL: http://arxiv.org/abs/2508.20454v1
• Date: Thu, 28 Aug 2025 06:00:27 GMT
• 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,
• Abstract summary: Lithium niobate (LN) microring resonators serve as an outstanding platform for the precise control of integrated quantum frequency combs (QFCs)<n>We introduce a bipartite entanglement criterion to investigate the pairwise entanglement characteristics of QFCs generated via the spontaneous parametric down-conversion process.<n>We propose a universal framework for analyzing multimode squeezing in quadratic frequency combs, enabling the realization of ultrabroadband and high-degree multimode squeezing.
• Score: 12.155095846343938
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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