On-chip squeezed light in the audio frequency band
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.
Versions
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BibTeX
@misc{zhu2026onchip,
title = {{On-chip squeezed light in the audio frequency band}},
author = {Xuezhi Zhu and Yunyun Cao and Rui Liu and Yaya He and Fan Zhang and Yaqing Zhang and Shiwei Du and Meihong Wang and Xiaoshun Jiang and Xiaolong Su},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.11004},
eprint = {2609.11004},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.11004},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - On-chip squeezed light in the audio frequency band
AU - Xuezhi Zhu
AU - Yunyun Cao
AU - Rui Liu
AU - Yaya He
AU - Fan Zhang
AU - Yaqing Zhang
AU - Shiwei Du
AU - Meihong Wang
AU - Xiaoshun Jiang
AU - Xiaolong Su
PY - 2026
DA - 2026/09/10
PB - arXiv
DO - 10.48550/arxiv.2609.11004
UR - https://arxiv.org/abs/2609.11004
AB - 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.
ER -