First electromechanical resonator to operate beyond 100 GHz

https://techxplore.com/news/2023-04-electromechanical-resonator-ghz.html

"mechanical entities maintain quantum ground state at kelvin temperatures... more resilient to thermal noise so don't have to cool to millikelvin... very small signals at such high frequency, we have to adopt particular designs to achieve that," he said. "In this work, we use a millimeter-wave resonator that is incorporated into a suspended lithium niobate platform, which can provide the efficient electromechanical transduction in the sub-terahertz regime. And without it, it would not be easy at all"