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A transducer capable of converting quantum information stored as microwavesinto telecom-wavelength signals is a critical piece of future quantumtechnology as it promises to enable the networking of quantum processors.Cavity optomechanical devices that are simultaneously coupled to microwavefields and optical resonances are being pursued in this regard. Yet even in theclassical regime, developing optical modulators based on cavity optomechanicscould provide lower power or higher bandwidth alternatives to currenttechnology. Here we demonstrate a magnetically-mediated wavelength conversiontechnique, based on mixing high frequency tones with an optomechanicaltorsional resonator. This process can act either as an optical phase oramplitude modulator depending on the experimental configuration, and thecarrier modulation is always coherent with the input tone. Such coherenceallows classical information transduction and transmission via the technique ofphase-shift keying. We demonstrate that we can encode up to eight bins ofinformation, corresponding to three bits, simultaneously and demonstrate thetransmission of an 52,500 pixel image over 6 km of optical fiber with just0.67% error. Furthermore, we show that magneto-optomechanical transduction canbe described in a fully quantum manner, implying that this is a viable approachto signal transduction at the single quantum level.

Coherent Magneto-Optomechanical Signal Transduction and Long-Distance Phase-Shift Keying