Quantum transducers can transfer quantum information between differentsystems. Microwave-optical photon conversion is important for future quantumnetworks to interconnect remote superconducting quantum computers with opticalfibers. Here we propose a high-speed quantum transducer based on asingle-photon emitter in an atomically thin membrane resonator that can couplesingle microwave photons to single optical photons. The 2D resonator will be afreestanding van der Waals heterostructure (may consist of graphene, hexagonalboron nitride, or other 2D materials) that hosts a quantum emitter. Themechanical vibration (phonon) of the 2D resonator interacts with opticalphotons by shifting the optical transition frequency of the single-photonemitter with strain or the Stark effect. The mechanical vibration couples tomicrowave photons by shifting the resonant frequency of a LC circuit thatincludes the membrane. Thanks to the small mass of the 2D resonator, both thesingle-photon optomechanical coupling strength and the electromechanicalcoupling strength can be about 100 MHz. This provides a way for high-speedquantum state transfer between a microwave photon, a phonon, and an opticalphoton.
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