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We propose a scheme to achieving simultaneous nonreciprocal unconventionalphoton blockade in a system of two coupled spining resonators marked by modes aand b, each incorporating an degenerate optical parametric amplifier (DOPA). Byrotating the resonators, input light from opposite directions induces oppositeSagnac-Fizeau shifts. These shifts result in the emergence or absence ofquantum destructive interference in two-photon excitation processes.Specifically, when destructive quantum interference occurs, photons from oneinput direction are simultaneously blocked in both resonators, whereas theabsence of complete destructive quantum interference causes the blockade effectto vanish for inputs from the opposite direction. We analytically give theoptimal parameter conditions to achieve simultaneous strong photon blockadewith the parametric amplification. By adjusting the Sagnac-Fizeau shifts, wecan make mode a nonreciprocal photon blockade, while mode b exhibits photonblockade in both directions. This work lays a theoretical foundation for thedevelopment of multimode simultaneous nonreciprocal unconventionalsingle-photon devices, which hold promising potential in multichanneltopological optics and chiral quantum technologies.

Simultaneous nonreciprocal unconventional photon blockade via two degenerate optical parametric amplifiers in spinning resonators