Random quantum vacuum fluctuations exist everywhere leading to the Casimir interaction between macroscopic bodies. The Casimir effect can dominate the interaction between microstructures at small separations, and hence a device that can leverage the Casimir force is in demand. In this talk, I will present the first Casimir diode and Casimir transistor system. For the Casimir diode system, we realize the first experimental demonstration of quantum vacuum mediated non-reciprocal energy transfer between two micromechanical oscillations. For the Casimir transistor system, we observe the three-body Casimir effects experimentally for the first time and demonstrate switching and amplifying quantum-fluctuation-mediated energy transfer in a three-terminal Casimir system. These two works represent an important development in optomechanics with virtual photons and will have potential applications in sensing and information processing.
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