Techniques for bidirectional transduction of quantum level signals between optical and microwave frequencies using a common acoustic intermediary

A system for transducing a quantum signal, comprising:

• an optical device;
• a suspended crystalline optical waveguide configured to propagate a quantum optical signal, the suspended crystalline optical waveguide being optically coupled to the optical device;
• a first suspended crystalline transducer coupled to the suspended crystalline optical waveguide, the first suspended crystalline transducer comprising a plurality of holes that are configured to trap and convert a quantum signal between the quantum optical signal and a quantum acoustic signal, wherein the first suspended crystalline transducer oscillates at a tuning frequency during transduction;
• a second suspended crystalline transducer coupled to the first suspended crystalline transducer, the second suspended crystalline transducer configured to oscillate at the tuning frequency to convert the quantum signal between the quantum acoustic signal and a single-photon level microwave signal;
• and
• a conductor coupled to the second suspended crystalline transducer wherein the suspended crystalline optical waveguide is surrounded by a plurality of suspended crystalline structures, disposed in a geometric design to isolate the quantum optical signal outside of the suspended crystalline optical waveguide.