Pulsed quantum processing of two mechanical elements

High quality mechanical elements have been shown to be a viable candidate for storage of quantum information. To become useful as processing elements, one has to be able to initialize the mechanics to a pure state, generate interactions with other mechanical elements and measure the resulting state with high efficiency. While each of these capabilities has been demonstrated separately, integrating it to a single device requires reconciling the different resulting constraints. Here we design, fabricate and measure a microwave resonator coupled to two separate mechanical resonators (drums). We use spatial addressing as well as frequency and time domain multiplexing to individually address the drums using microwave pulses. This allows us to perform ground state cooling, simultaneous readout and a two-mode coupling gate between the mechanics. Our work is a stepping stone on the path to information processing with multi-mechanical arrays.