On-chip squeezed light in the audio frequency band

• URL: http://arxiv.org/abs/2609.11004v1
• Date: Thu, 10 Sep 2026 02:28:28 GMT
• Title: On-chip squeezed light in the audio frequency band
• Abstract summary: We show on-chip generation of audio-band two-mode squeezed states down to 60 Hz in a silica microcavity.<n>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.<n>Our results establish an experimentally accessible route toward on-chip phase-stable audio-band squeezing.
• Score: 5.74157003050088
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: 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.

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