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

• URL: http://arxiv.org/abs/2512.16582v1
• Date: Thu, 18 Dec 2025 14:26:20 GMT
• Title: Giant-atom quantum acoustodynamics in hybrid superconducting-phononic integrated circuits
• Abstract summary: We demonstrate a giant atom by coupling a superconducting transmon qubit to a lithium niobate phononic waveguide.<n>The giant atom yields non-Markovian relaxation dynamics characterized by phonon backflow.<n>Our results establish phononic integrated circuits as a versatile platform for giant-atom physics.
• Score: 11.756855104196609
• License: http://creativecommons.org/licenses/by/4.0/
• 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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