Fig. 1. Schematic principle of precision phase estimation. (a) SU(2) interferometer fed by SOC state; (b) corresponding states transformation determined by spatial Stokes tomography

Fig. 2. Experimental schematic diagram

Fig. 3. Experimental results of phase measurement. (a) Measured SOC states on the HOPS; (b) equivalent interferometric amplitude signal; (c) corresponding equal phase steps; (d) measured minimum phase step of LCR