Engineering electron-phonon coupling of quantum defects to a semi-confocal acoustic resonator

Abstract

Diamond-based microelectromechanical systems (MEMS) enable direct coupling between the quantum states of nitrogen-vacancy (NV) centers and the phonon modes of a mechanical resonator. One example, diamond high-overtone bulk acoustic resonators (HBARs), feature an integrated piezoelectric transducer and support high-quality factor resonance modes into the GHz frequency range. The acoustic modes allow mechanical manipulation of deeply embedded NV centers with long spin and orbital coherence times. Unfortunately, the spin-phonon coupling rate is limited by the large resonator size, $>100\mu$m, and thus strongly-coupled NV electron-phonon interactions remain out of reach in current diamond BAR devices. Here, we report the design and fabrication of a semi-confocal HBAR (SCHBAR) device on diamond (silicon carbide) with $f\cdot Q>10^{12}$($>10^{13}$). The semi-confocal geometry confines the phonon mode laterally below 10~$\mu$m. This drastic reduction in modal volume enhances defect center electron-phonon coupling. For the native NV centers inside the diamond device, we demonstrate mechanically driven spin transitions and show a high strain-driving efficiency with a Rabi frequency of $(2\pi )2.19(14)$~MHz/V${}_p$, which is comparable to a typical microwave antenna at the same microwave power.

arXiv comment29 pages, 12 figures including supporting information

References in corpus (28)

• The nitrogen-vacancy colour centre in diamond
• High-sensitivity diamond magnetometer with nanoscale resolution
• Thermoelastic Damping in Micro- and Nano-Mechanical Systems
• Heralded entanglement between solid-state qubits separated by 3 meters
• Coherent control of single spins in silicon carbide at room temperature
• Strong Coupling of a Spin Ensemble to a Superconducting Resonator
• Isolated electron spins in silicon carbide with millisecond-coherence times
• Silicon-Vacancy Spin Qubit in Diamond: A Quantum Memory Exceeding 10 ms with Single-Shot State Readout
• Quantum acoustics with superconducting qubits
• Dynamic polarization of single nuclear spins by optical pumping of NV color centers in diamond at room temperature
• Entanglement Distillation between Solid-State Quantum Network Nodes
• Dynamic strain-mediated coupling of a single diamond spin to a mechanical resonator
• Resolved sidebands in a strain-coupled hybrid spin-oscillator system
• Strongly enhanced photon collection from diamond defect centres under micro-fabricated integrated solid immersion lenses
• Strain engineering of the silicon-vacancy center in diamond
• Optomechanical Quantum Control of a Nitrogen Vacancy Center in Diamond
• Probing spin-phonon interactions in silicon carbide with Gaussian acoustics
• Mechanical spin control of nitrogen-vacancy centers in diamond
• Strong mechanical driving of a single electron spin
• Fabrication of all diamond scanning probes for nanoscale magnetometry
• Diamond optomechanical crystals
• Nanomechanical sensing using spins in diamond
• Depolarization dynamics in a strongly interacting solid-state spin ensemble
• Extremely Low Loss Phonon-Trapping Cryogenic Acoustic Cavities for Future Physical Experiments
• Optically coherent nitrogen-vacancy centers in μm-thin etched diamond membranes
• Continuous dynamical decoupling of a single diamond nitrogen-vacancy center spin with a mechanical resonator
• Orbital state manipulation of a diamond nitrogen-vacancy center using a mechanical resonator
• Diamond Processing by Focused Ion Beam - Surface Damage and Recovery

Cited by in corpus (20)

• Coherent Acoustic Control of a Single Silicon Vacancy Spin in Diamond
• Observation of stimulated Brillouin scattering in silicon nitride integrated waveguides
• Epitaxial bulk acoustic wave resonators as highly coherent multi-phonon sources for quantum acoustodynamics
• Tunable and Transferable Diamond Membranes for Integrated Quantum Technologies
• Coupling spins to nanomechanical resonators: Toward quantum spin-mechanics
• Anisotropic Spin-Acoustic Resonance in Silicon Carbide at Room Temperature
• Generation of Ultra-Low Power Phononic Combs
• Characterizing temperature and strain variations with qubit ensembles for their robust coherence protection
• Impedance-matched High-overtone Bulk Acoustic Resonator
• Measurements of a quantum bulk acoustic resonator using a superconducting qubit
• Semi-insulating 4H-SiC lateral bulk acoustic wave resonators
• Long-lived coherence in driven spin systems: from two to infinite spatial dimensions
• Ultracoherent GHz Diamond Spin-Mechanical Lamb Wave Resonators
• Diamond nanomechanical resonators protected by a phononic band gap
• Selective acoustic control of photon-mediated qubit-qubit interactions
• Quantum Sensing of Single Phonons via Phonon Drag in Two-Dimensional Materials
• Unified simulation methods for quantum acoustic devices
• Piezoelectric microresonators for sensitive spin detection
• Investigation of Phonon Lifetimes and Magnon-Phonon Coupling in YIG/GGG Hybrid Magnonic Systems in the Diffraction Limited Regime
• Dark Exciton Giant Rabi Oscillations with no External Magnetic Field