Quantum microcombs generated in high-Q microresonators provide compact, multiplexed sources of entangled modes for continuous-variable (CV) quantum information processing. While deterministic generation of CV states via Kerr-induced two-mode squeezing has been demonstrated, achieving spectrally uniform squeezing remains challenging because of asymmetry and anomalies in the dispersion profile. Here we overcome these limitations by combining a microresonator with an engineered mode spectrum and optimized pump conditions. We realize a CV quantum microcomb comprising 14 independent two-mode squeezed states, each exhibiting more than 4 dB of raw squeezing (up to 4.3 dB) across a 0.7 THz bandwidth. This uniform, high-performance quantum resource represents a key step toward scalable, integrated CV quantum technologies operating beyond classical limits.
@article{arxiv.2512.08650,
title = {Perfect continuous-variable quantum microcombs},
author = {Kangkang Li and Yue Wang and Ze Wang and Xin Zhou and Jincheng Li and Yinke Cheng and Binyan Wu and Qihuang Gong and Bei-Bei Li and Qi-Fan Yang},
journal= {arXiv preprint arXiv:2512.08650},
year = {2025}
}