Fig. 1. Schematic diagram of quantum interferometer based on OPA

Fig. 2. SNRI of quantum interferometer varying with internal loss and total external loss of interferometer

Fig. 3. Sensitivity of quantum interferometer varying with intracavity loss of OPA

Fig. 4. Sensitivity of quantum interferometer varying with gain of OPA under different I₀

Fig. 5. SNRI of quantum interferometer varying with analysis frequency under different γ