Multiterminal Nonreciprocal Routing in an Optomechanical Plaquette via Synthetic Magnetism

TL;DR

This paper proposes a multi-terminal nonreciprocal routing device in an optomechanical system, utilizing synthetic magnetism to break time-reversal symmetry, with potential applications in quantum networks and secure communication.

Contribution

It introduces a novel nonreciprocal router with multiple access channels based on an optomechanical plaquette, leveraging synthetic magnetism for nonreciprocity.

Findings

Analytical and numerical conditions for nonreciprocal routing are derived.

The system's robustness against perturbations is demonstrated.

The device enables quantum network security and quantum communication applications.

Abstract

Optomechanical systems with parametric coupling between optical (photon) and mechanical (phonon) modes provide a useful platform to realize various magnetic-free nonreciprocal devices, such as isolators, circulators, and directional amplifiers. However, nonreciprocal router with multiaccess channels has not been extensively studied yet. Here, we propose a nonreciprocal router with one transmitter, one receiver, and two output terminals, based on an optomechanical plaquette composing of two optical modes and two mechanical modes. The time-reversal symmetry of the system is broken via synthetic magnetism induced by driving the two optical modes with phase-correlated laser fields. The prerequisites for nonreciprocal routing are obtained both analytically and numerically, and the robustness of the nonreciprocity is demonstrated numerically. Multi-terminal nonreciprocal router in optomechanical plaquette provides a useful quantum node for development of quantum network information security and realization of quantum secure communication.