Fig. 1. Distribution of the squeezed state in phase space and the photon number distribution of the squeezed state

Fig. 2. Theoretical diagram of the quantum enhanced self-homodyne detection (PBS: polarization beam splitter; PD: photodetector; SA: spectrum analyzer)

Fig. 3. Experimental setup of quantum enhanced LiDAR detection based on the squeezed state light field. HR: high reflectivity mirror; AOM: audio-optical modulator; BS: beam splitter; DBS: dichromatic beam splitter; OPA: optical parameter amplifier; PBS_1-2: polarization beam splitter; PD: photodetector; SA: spectrum analyzer

Fig. 4. Measurement results of squeezing level of the integrated squeezed light field ((a) Quantum noise limit; (b) Noise spectrum of squeezed state light field; (c) Minimum squeezed degree of noise spectrum of squeezed state light field)

Fig. 5. Measured results of quantum enhanced Dopplor information detection by self-homodyne detection system ((a) Noise spectrum of squeezed light injection echo signal; (b) Noise spectrum of shot noise datum; (c) Noise spectrum of coherent light injection echo signal)