Generation of large amplitude phonon states in quantum acoustics
Clinton A. Potts (Kavli institute of nanoscience Delft, TU Delft - QN/Steele Lab)
W.J.M. Franse (Kavli institute of nanoscience Delft, TU Delft - QN/Steele Lab)
V.A.S.V. Bittencourt (University of Strasbourg)
A. Metelmann (Karlsruhe Institut für Technologie, University of Strasbourg)
Gary Steele (TU Delft - QN/Steele Lab, Kavli institute of nanoscience Delft)
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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.
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