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Quantum acoustics with superconducting qubits.

Yiwen Chu1,2, Prashanta Kharel3,2, William H Renninger3,2

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Researchers developed a novel electromechanical device coupling superconducting qubits to high-frequency acoustic waves. This breakthrough enables quantum control of gigahertz phonons at the single-quantum level for quantum information applications.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Electromechanics

Background:

  • Mechanical objects are crucial for quantum information and metrology, serving as quantum memories or transducers.
  • Electromechanics aims to create robust, coherent devices linking motion to nonlinear quantum objects like superconducting qubits.

Purpose of the Study:

  • To experimentally demonstrate a high-frequency bulk acoustic wave resonator strongly coupled to a superconducting qubit.
  • To achieve quantum control and measurement of gigahertz phonons at the single-quantum level.

Main Methods:

  • Utilized piezoelectric transduction to couple a bulk acoustic wave resonator with a superconducting qubit.
  • Measured qubit and mechanical coherence times.
  • Demonstrated quantum control and measurement on gigahertz phonons.

Main Results:

  • Achieved strong coupling with a cooperativity of 260.
  • Measured qubit and mechanical coherence times of approximately 10 microseconds.
  • Showcased controllable access to multiple phonon modes using simple fabrication methods.

Conclusions:

  • The demonstrated device offers a robust platform for quantum electromechanical systems.
  • Enables single-quantum level control and measurement of gigahertz phonons, advancing quantum technologies.
  • Highlights the potential of piezoelectric transduction for scalable quantum devices.