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Optomechanical systems with parametric coupling between optical (photon) andmechanical (phonon) modes provide a useful platform to realize variousmagnetic-free nonreciprocal devices, such as isolators, circulators, anddirectional amplifiers. However, nonreciprocal router with multiaccess channelshas not been extensively studied yet. Here, we propose a nonreciprocal routerwith one transmitter, one receiver, and two output terminals, based on anoptomechanical plaquette composing of two optical modes and two mechanicalmodes. The time-reversal symmetry of the system is broken via syntheticmagnetism induced by driving the two optical modes with phase-correlated laserfields. The prerequisites for nonreciprocal routing are obtained bothanalytically and numerically, and the robustness of the nonreciprocity isdemonstrated numerically. Multi-terminal nonreciprocal router in optomechanicalplaquette provides a useful quantum node for development of quantum networkinformation security and realization of quantum secure communication.

Multiterminal Nonreciprocal Routing in an Optomechanical Plaquette via Synthetic Magnetism