Quantum vacuum mediated non-reciprocal topological energy transfer between two micromechanical oscillators

A Casimir diode

We report a quantum vacuum mediated non-reciprocal topological energy transfer between two micromechanical oscillators with different resonant frequencies.We engineer the system to include an exceptional point in the parameter space and observe the topological structure near it.By dynamically changing the parameters and encircling the exceptional point, we achieve non-reciprocal topological energy transfer with high contrast.Our work represents an important development in utilizing quantum vacuum fluctuations to regulate energy transfer at the nanoscale and build functional casimir devices.