发表机构
Shanxi University; Nanjing University（山西大学; 南京大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文在二氧化硅微腔中实现低至60赫兹的片上音频频段压缩光，通过相干梳控制方法实现相位稳定，并验证了纠缠，为集成光子学量子信息处理提供可扩展途径。
AI 中文摘要
音频频段的压缩光是量子计量和量子传感的关键资源。然而，由于技术噪声和可扩展相位参考的困难，在集成光子平台上实现稳定的音频频段压缩光仍然具有挑战性。在此，我们展示了在二氧化硅微腔中片上生成低至60赫兹的音频频段双模压缩态。为了在不直接锁定脆弱量子模式的情况下实现相位稳定操作，我们开发了一种相干梳控制方法，其中弱电光参考梳与真空在量子频率模式下以正交偏振共同传播。该方案提供了正交测量和长时间尺度相位稳定性，从而能够进行协方差矩阵重建。我们通过正部分转置准则验证纠缠，该准则通过最小辛特征值0.395（<0.5）确认不可分离性。我们的结果为片上相位稳定音频频段压缩光建立了一条实验上可实现的途径，并支持集成光子学连续变量量子信息处理的可扩展框架。
英文摘要
Squeezed light in the audio-frequency band is a key resource for quantum metrology and quantum sensing. However, realizing stable audio-frequency squeezed light on integrated photonic platforms remains challenging due to technical noise and the difficulty of scalable phase referencing. Here, we demonstrate on-chip generation of audio-band two-mode squeezed states down to 60 Hz in a silica microcavity. To enable phase-stable operation without directly locking fragile quantum modes, we develop a coherent-comb control method in which a weak electro-optic reference comb co-propagates with the vacuum at the quantum frequency modes in an orthogonal polarization. This scheme provides quadrature measurement and long-timescale phase stability, thereby enabling covariance-matrix reconstruction. We verify the entanglement with the positive partial transposition criterion, which confirms inseparability via a minimum symplectic eigenvalue of 0.395 ($<0.5$). Our results establish an experimentally accessible route toward on-chip phase-stable audio-band squeezing and support the scalable framework for continuous-variable quantum information processing with integrated photonics.
Journal refOn-chip squeezed light in the audio frequency band. Science Bulletin 2026, 71(19)
DOI：10.1016/j.scib.2026.08.054
