Quantum optomechanical control of long-lived bulk acoustic phonons

Abstract

High-fidelity quantum optomechanical control of a mechanical oscillator requires the ability to perform efficient, low-noise operations on long-lived phononic excitations. Microfabricated high-overtone bulk acoustic wave resonators ($\mu$HBARs) have been shown to support high-frequency (> 10 GHz) mechanical modes with exceptionally long coherence times (> 1.5 ms), making them a compelling resource for quantum optomechanical experiments. In this paper, we demonstrate a new optomechanical system that permits quantum optomechanical control of individual high-coherence phonon modes supported by such $\mu$HBARs for the first time. We use this system to perform laser cooling of such ultra-massive (7.5 $\mu$g) high frequency (12.6 GHz) phonon modes from an occupation of $\sim$22 to fewer than 0.4 phonons, corresponding to laser-based ground-state cooling of the most massive mechanical object to date. Through these laser cooling experiments, no absorption-induced heating is observed, demonstrating the resilience of the $\mu$HBAR against parasitic heating. The unique features of such $\mu$HBARs make them promising as the basis for a new class of quantum optomechanical systems that offer enhanced robustness to decoherence, necessary for efficient, low-noise photon-phonon conversion.

References in corpus (10)

• Coherent optical wavelength conversion via cavity-optomechanics
• Opto-mechanical transducers for long-distance quantum communication
• Optical wavelength conversion of quantum states with optomechanics
• Schrödinger cat states of a 16-microgram mechanical oscillator
• Entanglement-Enhanced Optomechanical Sensing
• Optomechanical quantum teleportation
• Parity measurement in the strong dispersive regime of circuit quantum acoustodynamics
• Macroscopic quantum test with bulk acoustic wave resonators
• A two-dimensional optomechanical crystal for quantum transduction
• Laser cooling of a Planck mass object close to the quantum ground state

Cited by in corpus (3)

• Purcell-enhanced spin-phonon coupling with a single color center
• Optomechanical resource for fault-tolerant quantum computing
• Sub-Bath Cooling in Bosonic Systems: Gaussian Constraints and Non-Gaussian Enhancements