Generation of Large Amplitude Phonon States in Quantum Acoustics

• URL: http://arxiv.org/abs/2312.13948v3
• Date: Tue, 08 Jul 2025 15:20:25 GMT
• Title: Generation of Large Amplitude Phonon States in Quantum Acoustics
• Authors: C. A. Potts, W. J. M. Franse, V. A. S. V. Bittencourt, A. Metelmann, G. A. Steele,
• Abstract summary: This work provides a key tool for generating arbitrary phonon states in circuit quantum acoustodynamics.<n>It is important for fundamental and quantum information applications.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The development of quantum acoustics has enabled the cooling of mechanical objects to their quantum ground state, generation of mechanical Fock-states, and Schrodinger cat states. Such demonstrations have made mechanical resonators attractive candidates for quantum information processing, metrology, and macroscopic tests of quantum mechanics. However, generating large-amplitude phonon states in quantum acoustic systems has been elusive. In this work, a single superconducting qubit coupled to a high-overtone bulk acoustic resonator is used to generate a large phonon population in an acoustic mode of a high-overtone resonator. We observe extended ringdowns of the qubit, confirming the generation of a large amplitude phonon state, and also observe an upper threshold behavior, a consequence of phonon quenching predicted by our model. This work provides a key tool for generating arbitrary phonon states in circuit quantum acoustodynamics, which is important for fundamental and quantum information applications.

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