Superconducting Acousto-optic Phase Modulator

Abstract

We report the development of a superconducting acousto-optic phase modulator fabricated on a lithium niobate substrate. A titanium-diffused optical waveguide is placed in a surface acoustic wave resonator, where the electrodes for mirrors and an interdigitated transducer are made of a superconducting niobium titanium nitride thin film. The device performance is evaluated as a substitute for the current electro-optic modulators, with the same fiber coupling scheme and comparable device size. Operating the device at a cryogenic temperature (T=8K), we observe the length-half-wave-voltage (length-$V_{\pi }$) product of 1.78 V$\cdot$cm. Numerical simulation is conducted to reproduce and extrapolate the performance of the device. An optical cavity with mirror coating on the input/output facets of the optical waveguide is tested for further enhancement of the modulation efficiency. A simple extension of the current device is estimated to achieve an efficient modulation with $V_{\pi }=$ 0.27 V.

arXiv comment9 pages, 4 figures

References in corpus (11)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Nanophotonic Lithium Niobate Electro-optic Modulators
• Development of Quantum InterConnects for Next-Generation Information Technologies
• Efficient bidirectional piezo-optomechanical transduction between microwave and optical frequency
• Universal Quantum Transducers based on Surface Acoustic Waves
• Microwave-to-optical conversion using lithium niobate thin-film acoustic resonators
• Extremely Low Loss Phonon-Trapping Cryogenic Acoustic Cavities for Future Physical Experiments
• On-chip microwave-to-optical quantum coherent converter based on a superconducting resonator coupled to an electro-optic microresonator
• Integrated microwave acousto-optic frequency shifter on thin-film lithium niobate
• High-Q photonic resonators and electro-optic coupling using silicon-on-lithium-niobate
• Cavity optomechanics with surface acoustic waves

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