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

Abstract

Generation of squeezed light source is a promising technique to overcome the standard quantum limit in precision measurement. Here, we demonstrate an experimental generation of quadrature squeezing resonating on the cesium D₂ line down to 10 Hz for the first time. The maximum squeezing in audio frequency band is 5.57 dB. Moreover, we have presented a single-photon modulation locking to control the squeezing angle, while effectively suppressing the influence of laser noise on low-frequency squeezing. The whole system operates steadily for hours. The generated low-frequency squeezed light source can be applied in quantum metrology, light−matter interaction investigation and quantum memory in the audio frequency band and even below.

Graphical abstract

Keywords

squeezed state / optical parametric amplifier / low-frequency squeezing

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (NSFC) (Nos. U21A6006, 11634008, 61875147, and 62175176) and the National Key Research and Development Program of China (No. 2017YFA0304502).

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