There has been considerable recent interest in realizing non-reciprocal interactions in driven photonic systems, with the goal of building devices like isolators and circulators. In this talk, I’ll present theoretical work showing how engineered dissipation in a photonic system can make almost any kind of interaction between two subsystems non-reciprocal. These ideas can be used to construct new kinds of non-reciprocal devices, including directional quantum-limited amplifiers. They can be implemented in a variety of different physical systems, including superconducting circuits and optomechanical systems.
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