Generation of large amplitude phonon states in quantum acoustics

Clinton A. Potts (), Wilfred J. M. Franse, Victor Augusto S. V. Bittencourt, Anja Metelmann and Gary A. Steele ()
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Clinton A. Potts: Delft University of Technology
Wilfred J. M. Franse: Delft University of Technology
Victor Augusto S. V. Bittencourt: Université de Strasbourg and CNRS
Anja Metelmann: Université de Strasbourg and CNRS
Gary A. Steele: Delft University of Technology

Nature Communications, 2025, vol. 16, issue 1, 1-6

Abstract: Abstract The development of quantum acoustics has enabled the cooling of mechanical objects to their quantum ground state, generation of mechanical Fock-states, and Schrödinger 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.

Date: 2025
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DOI: 10.1038/s41467-025-61237-8

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