Quantum-enhanced laser phase noise filter

• URL: http://arxiv.org/abs/2507.05771v1
• Date: Tue, 08 Jul 2025 08:19:50 GMT
• Title: Quantum-enhanced laser phase noise filter
• Authors: Ruixin Li, Nanjing Jiao, Bingnan An, Yajun Wang, Shaoping Shi, Long Tian, Wei Li, Yaohui Zheng,
• Abstract summary: A maximum of 5 dB quantum-enhanced phase noise suppression is realized across the Fourier frequencies from 5 kHz to 60 kHz.<n>The demonstration unlocks the application of squeezed vacuum state in laser phase noise suppression.
• Score: 5.945092943189474
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Quantum noise is the fundamental limit of laser phase noise filter. We cannot realize the effective quantum-enhanced phase noise suppression through simply utilizing amplitude noise suppression scheme. Here, we present the first experimental demonstration of a quantum-enhanced laser phase noise filter, achieved by employing a noise ellipse rotation phase noise readout technique combined with an excess amplitude noise suppression scheme. We address the primary limitations in the extracting of laser phase noise, and make the quantum enhancement via squeezed vacuum injection feasible. A maximum of 5 dB quantum-enhanced phase noise suppression is realized across the Fourier frequencies from 5 kHz to 60 kHz. The demonstration unlocks the application of squeezed vacuum state in laser phase noise suppression.

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