Precise control of photon-photon interactions is fundamental to quantum information processing. This study explores the simultaneous manipulation of opposite photon correlations (photon blockade and photon bunching) through optical parametric amplification. The nonlinear pump field, together with the driving field, establishes asymmetric photon-excitation pathways for whispering-gallery modes (WGMs), enabling the concurrent generation of distinct photon-photon interactions over a wide parameter range. Two sets of optimal parameters are derived to selectively induce destructive interference in each WGM: one set for the first WGM and the other for the second. Furthermore, we show the resulting photon correlations can be spatially switched between these modes by tuning the corresponding optimal parameters. This work elucidates the mechanism governing the coexistence and controllable switching of opposite photon correlations, offering another perspective for in-depth studies of quantum correlations and potential applications in switchable chiral quantum technologies.

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• Nonlinear optics
• Photon statistics
• Quantum optics