Fig. 1: Superconducting cavity piezo-optomechanical system.
From: Cavity piezo-mechanics for superconducting-nanophotonic quantum interface
a A schematic of a 10-GHz mechanical resonator simultaneously coupled with an optical cavity and a superconducting cavity to achieve resonantly enhanced optomechanical and electromechanical interactions at the same time. The superconducting cavity is inductively coupled to a transmission line for microwave signal input and output. b Interaction diagram of the triple-resonance system. gem and gom denote the electromechanical and the cavity-enhanced optomechanical coupling rates, respectively. c Photon conversion mechanism in the frequency domain. The blue, green, and red Lorentzian shapes stand for the microwave, mechanical, and optical resonances, respectively. A red-detuned optical pump is indicated as the purple arrow. d Experimental realization of the triply resonant superconducting piezo-optomechancial interface (schematic not to scale). A frequency-tunable superconducting “Ouroboros” microwave resonator (yellow) is aligned and coupled with a piezo-optomechanical micro-disk through the piezoelectric effect. Microwave and optical photons are interconverted via cavity-enhanced interactions with 10-GHz phonons supported by the thickness mode of the micro-disk.
