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Quantum control of surface acoustic-wave phonons.

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Scientists achieved full quantum control of a macroscale mechanical resonator, generating non-classical states. This breakthrough in quantum physics enables new quantum sensing and computation applications.

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Area of Science:

  • Quantum Physics
  • Quantum Mechanics
  • Cavity Optomechanics

Background:

  • Non-classical quantum states and superpositions are hallmarks of quantum physics, demonstrated in systems like ions and photons.
  • Previous demonstrations in mechanical systems were indirect, limited by linear responses and low frequencies hindering quantum ground state access.
  • Mechanical systems offer potential in quantum sensing, computation, and communication.

Purpose of the Study:

  • To demonstrate full quantum control over the mechanical state of a macroscale mechanical resonator.
  • To generate and precisely manipulate non-classical quantum states in a mechanical system.
  • To enable applications of mechanical resonators in the quantum regime.

Main Methods:

  • Strongly coupling a surface acoustic-wave (SAW) resonator to a superconducting qubit.
  • Utilizing the superconducting qubit for control and measurement of quantum states in the mechanical resonator.
  • Employing Wigner tomography for state mapping and characterization.

Main Results:

  • Achieved full quantum control of the mechanical state of a macroscale resonator.
  • Generated a non-classical superposition of zero- and one-phonon Fock states.
  • Successfully mapped quantum states using Wigner tomography.

Conclusions:

  • Demonstrated precise, programmable quantum control of a macroscale mechanical resonator.
  • This capability is crucial for advancing surface acoustic wave applications in the quantum limit.
  • Opens possibilities for coupling disparate quantum systems and developing novel quantum technologies.