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Generation of quantum light source is a promising technique to overcome thestandard quantum limit in precision measurement. Here, we demonstrate anexperimental generation of quadrature squeezing resonating on the cesium D2line down to 10 Hz for the first time. The maximum squeezing in audio frequencyband is 5.57 dB. Moreover, we have presented a single-photon modulation lockingto control the squeezing angle, while effectively suppressing the influence oflaser noise on low-frequency squeezing. The whole system operates steadily forhours. The generated low-frequency quantum light source can be applied inquantum metrology,light-matter interaction investigation and quantum memory inthe audio frequency band and even below.

10-Hertz quantum light source generation on the cesium D2 line using single photon modulation