Measurements of a quantum bulk acoustic resonator using a superconducting qubit

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.

References in corpus (26)

• Cavity Optomechanics
• Quantum sensing
• Charge insensitive qubit design derived from the Cooper pair box
• Laser cooling of a nanomechanical oscillator into its quantum ground state
• Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems
• Quantum technologies with hybrid systems
• Coherent Josephson qubit suitable for scalable quantum integrated circuits
• Remote quantum entanglement between two micromechanical oscillators
• Propagating phonons coupled to an artificial atom
• Planar Superconducting Resonators with Internal Quality Factors above One Million
• Quantum control of surface acoustic wave phonons
• Measurement of the quantum zero-point motion of a nanomechanical resonator
• Phonon-mediated quantum state transfer and remote qubit entanglement
• Creation and control of multi-phonon Fock states in a bulk acoustic wave resonator
• Phononic bandgap nano-acoustic cavity with ultralong phonon lifetime
• Probing spin-phonon interactions in silicon carbide with Gaussian acoustics
• Hanbury Brown and Twiss interferometry of single phonons from an optomechanical resonator
• Resolving the energy levels of a nanomechanical oscillator
• Three-dimensional superconducting resonators at $T<20$ mK with the photon lifetime up to $\tau =2$ seconds
• Two-Dimensional Optomechanical Crystal Cavity with High Quantum Cooperativity
• Resolving Phonon Fock States in a Multimode Cavity with a Double-Slit Qubit
• Bulk crystalline optomechanics
• Epitaxial bulk acoustic wave resonators as highly coherent multi-phonon sources for quantum acoustodynamics
• Storing quantum information in spins and high-sensitivity ESR
• Engineering electron-phonon coupling of quantum defects to a semi-confocal acoustic resonator
• Sideband control of a multimode quantum bulk acoustic system

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• Gigahertz-frequency Lamb wave resonator cavities on suspended lithium niobate for quantum acoustics