Enhanced sensitivity in Rydberg-atom-based dual-channel heterodyne receivers via cross-spectral analysis

IF 7.1 1区物理与天体物理 Q1 OPTICS

Photonics Research Pub Date : 2026-09-30 DOI:10.1364/prj.609462

Jianfei Tian,Wenguang Yang,Hao Zhang,Zongkai Liu,Junyao Xie,Liantuan Xiao,Suotang Jia,Linjie Zhang

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引用次数: 0

Abstract

Cross-spectral analysis is widely used for weak-signal extraction due to its ability to suppress uncorrelated noise. The common frequency-correlated noise of the probe laser in different detection channels restricts the cross-spectral noise suppression and degrades sensitivity. We propose and experimentally demonstrate a dual-channel Rydberg heterodyne scheme based on asymmetric optical detuning. This method with cross-spectral density (CSD) processing reduces the interchannel probe-frequency noise correlation while preserving the common microwave-induced atomic response essential for signal coherence. Experimental results confirm that asymmetric detuning selectively suppresses laser-noise-induced coherence without degrading signal correlation and thus improves the signal-to-noise ratio (SNR). Compared with single-channel power spectral density (PSD) analysis, this method reduces the noise floor and improves the SNR by 12 dB for the resonant case and by 3.7 dB for the detuned case. These results provide a practical and readily implementable strategy for suppressing correlated technical noise in Rydberg heterodyne receivers, advancing the development of high-sensitivity electric-field metrology.

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通过交叉光谱分析提高基于里德堡原子的双通道外差接收机的灵敏度

交叉谱分析由于具有抑制非相关噪声的能力，被广泛应用于弱信号提取。探测激光在不同探测通道中存在共同的频率相关噪声，限制了交叉光谱噪声的抑制，降低了灵敏度。我们提出并实验证明了一种基于非对称光失谐的双通道Rydberg外差方案。该方法采用交叉谱密度（CSD）处理，降低了通道间探测频率噪声相关性，同时保留了信号相干性所必需的常见微波诱导原子响应。实验结果证实，非对称失谐选择性地抑制了激光噪声诱导的相干性，而不会降低信号的相关性，从而提高了信噪比。与单通道功率谱密度（PSD）分析相比，该方法降低了本底噪声，在谐振情况下信噪比提高了12 dB，在失谐情况下提高了3.7 dB。这些结果为抑制Rydberg外差接收机的相关技术噪声提供了一种实用且易于实现的策略，促进了高灵敏度电场测量的发展。

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来源期刊

Photonics Research OPTICS-

CiteScore

13.60

自引率

5.30%

发文量

1325

期刊介绍： Photonics Research is a joint publishing effort of the OSA and Chinese Laser Press.It publishes fundamental and applied research progress in optics and photonics. Topics include, but are not limited to, lasers, LEDs and other light sources; fiber optics and optical communications; imaging, detectors and sensors; novel materials and engineered structures; optical data storage and displays; plasmonics; quantum optics; diffractive optics and guided optics; medical optics and biophotonics; ultraviolet and x-rays; terahertz technology.