Bidirectional microwave-optical transduction based on integration of high-overtone bulk acoustic resonators and photonic circuits

• URL: http://arxiv.org/abs/2308.02706v2
• Date: Wed, 13 Dec 2023 17:24:45 GMT
• Title: Bidirectional microwave-optical transduction based on integration of high-overtone bulk acoustic resonators and photonic circuits
• Authors: Terence Bl\'esin, Wil Kao, Anat Siddharth, Rui N. Wang, Alaina Attanasio, Hao Tian, Sunil A. Bhave, Tobias J. Kippenberg
• Abstract summary: Coherent interconversion between microwave and optical frequencies can serve as both classical and quantum interfaces for computing, communication, and sensing. We present a compact microwave-optical transducer based on monolithic integration of piezoelectric actuators atop silicon nitride photonic circuits.
• Score: 8.119789403079455
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Coherent interconversion between microwave and optical frequencies can serve as both classical and quantum interfaces for computing, communication, and sensing. Here, we present a compact microwave-optical transducer based on monolithic integration of piezoelectric actuators atop silicon nitride photonic circuits. Such an actuator directly couples microwave signals to a high-overtone bulk acoustic resonator defined by the suspended silica cladding of the optical waveguide core, which leads to enhanced electromechanical and optomechanical couplings. At room temperature, this triply resonant piezo-optomechanical transducer achieves an off-chip photon number conversion efficiency of -48 dB over a bandwidth of 25 MHz at an input pump power of 21 dBm. The approach is scalable in manufacturing and, unlike existing electro-optic transducers, does not rely on superconducting resonators. As the transduction process is bidirectional, we further demonstrate synthesis of microwave pulses from a purely optical input. Combined with the capability of leveraging multiple acoustic modes for transduction, the present platform offers prospects for building frequency-multiplexed qubit interconnects and for microwave photonics at large.

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