Optomechanical Quantum Control of Long-lived Bulk Acoustic Phonons

Key Points

• Laser cooling achieved for individual acoustic phonon modes to ground-state levels, ⟨ n ⟩ < 0.4.
• The bulk acoustic resonator enables effective quantum control over long-lived phonon states.
• This research provides a pathway for advanced applications in quantum information and phononics.
• Characterization of the system enhances understanding of phonon manipulation techniques.