Measurements of a quantum bulk acoustic resonator using a superconducting qubit

• URL: http://arxiv.org/abs/2012.04583v1
• Date: Tue, 8 Dec 2020 17:36:33 GMT
• Title: Measurements of a quantum bulk acoustic resonator using a superconducting qubit
• Authors: M.-H. Chou, \'E. Dumur, Y. P. Zhong, G. A. Peairs, A. Bienfait, H.-S. Chang, C. R. Conner, J. Grebel, R. G. Povey, K. J. Satzinger, A. N. Cleland
• Abstract summary: Phonons hold promise for quantum-focused applications as diverse as sensing, information processing, and communication. We describe a piezoelectric quantum bulk acoustic resonator (QBAR) with a 4.88 GHz resonant frequency. We couple this QBAR resonator to a superconducting qubit on a separate die and demonstrate quantum control of the mechanics in the coupled system.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Phonon modes at microwave frequencies can be cooled to their quantum ground state using conventional cryogenic refrigeration, providing a convenient way to study and manipulate quantum states at the single phonon level. Phonons are of particular interest because mechanical deformations can mediate interactions with a wide range of different quantum systems, including solid-state defects, superconducting qubits, as well as optical photons when using optomechanically-active constructs. Phonons thus hold promise for quantum-focused applications as diverse as sensing, information processing, and communication. Here, we describe a piezoelectric quantum bulk acoustic resonator (QBAR) with a 4.88 GHz resonant frequency that at cryogenic temperatures displays large electromechanical coupling strength combined with a high intrinsic mechanical quality factor $Q_i \approx 4.3 \times 10^4$. Using a recently-developed flip-chip technique, we couple this QBAR resonator to a superconducting qubit on a separate die and demonstrate quantum control of the mechanics in the coupled system. This approach promises a facile and flexible experimental approach to quantum acoustics and hybrid quantum systems.

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