Cavity electro-optics with a high-impedance superconducting resonator

Coherent microwave-optical transduction facilitates optical readout and control of superconducting qubits, long-distance quantum communication, and hybrid quantum architectures. State-of-the-art transducers that leverage superconducting cavity electro-optics remain limited by electro-optic coupling rates. Increasing the optical pump power to compensate typically introduces excess noise and imposes a trade-off with pulse duty cycle. To address these limitations, we report progress toward an on-chip, triply-resonant electro-optic transducer combining high-kinetic-inductance niobium nitride with lithium tantalate on insulator. The device employs a compact photonic molecule capacitively coupled to a microwave resonator via the Pockels effect. We will discuss device design and fabrication, present preliminary characterization results, and outline prospects for quantum networking applications.