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arXiv · 2512.16582

Giant-atom quantum acoustodynamics in hybrid superconducting-phononic integrated circuits

Lintao Xiao·Bo Zhang·Yu Zeng·Xiaoxuan Pan·Jia-Qi Wang·Ziyue Hua·Hongwei Huang·Yifang Xu·Guangming Xue·Haifeng Yu·Xin-Biao Xu·Weiting Wang·Chang-Ling Zou·Luyan Sun
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Abstract

We demonstrate a giant atom by coupling a superconducting transmon qubit to a lithium niobate phononic waveguide at two points separated by about 600 acoustic wavelengths, with a propagation delay of 125 ns. The giant atom yields non-Markovian relaxation dynamics characterized by phonon backflow and a frequency-dependent effective decay rate varying four-fold over merely 4 MHz, corresponding to a Purcell factor exceeding 40. Exploiting this frequency-dependent dissipation, we prepare quantum superposition states with high purity. Our results establish phononic integrated circuits as a versatile platform for giant-atom physics, providing highly tunable quantum devices for advanced quantum information processing.

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Lintao Xiao, Bo Zhang, Yu Zeng, Xiaoxuan Pan, Jia-Qi Wang, Ziyue Hua, Hongwei Huang, Yifang Xu, Guangming Xue, Haifeng Yu, Xin-Biao Xu, Weiting Wang, Chang-Ling Zou, Luyan Sun. 2025-12-18. Giant-atom quantum acoustodynamics in hybrid superconducting-phononic integrated circuits. https://arxiv.org/abs/2512.16582

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