Quantum acoustic

In recent years traveling phonons – quantized guided mechanical wavepackets – have gained more and more attention as a medium to transmit quantum states, due to their small size and low propagation speed compared to other carriers, such as electrons or photons. Moreover, phonons are highly promising candidates to connect heterogeneous quantum systems on a chip, thanks to their ability to couple to numerous systems. Having coherent control over highly confined phonons is an outstanding challenge, and would represent a significant step towards integrated devices for quantum information processes. The basic toolbox for realizing this – waveguide, beam-splitter and phase shifter – is presented here.