Viewed as resources for quantum information processing, microwave and optical fields offer complementary strengths. The ability to transduce quantum information between microwave and optical frequencies is an essential technology in realizing an extended quantum network. This talk describes the design and characterization of a device that couples one mode of a micromechanical oscillator to a resonant microwave circuit and a high-finesse optical cavity, thereby realizing a mechanically mediated electro-optic converter. We have operated this converter at T < 100 mK, and demonstrated unprecedented conversion efficiency of 47% and added noise of 38 photons. I describe recent improvements that should produce a device that is near the threshold for quantum conversion.
Peter Burns / JILA, Lehnert group
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