Fig. 1. Flow chart of peak estimation of echo pulse

Fig. 2. Diagram of ranging based on quantum illumination

Fig. 3. Statistical distribution of coherent and squeezed states under different compression parameters. (a) r=0.5; (b) r=2.0

Fig. 4. Ranging scheme with entangled photon based on quantum illumination

Fig. 5. Diagram of covariance matrix elements based on quantum compression measurement

Fig. 6. Diagram of joint covariance matrix elements based on quantum illumination

Fig. 7. Relationship between detection error probability and average photon numbers. (a) Average number of signal photon; (b) average number of noise photon

Fig. 8. Error probability performance of quantum illumination compared to classical scheme