Semiconductor-on-diamond cavities for spin optomechanics

Area of Science:

• Quantum optics
• Nanophotonics
• Solid-state physics

Background:

• Optomechanical cavities are crucial for quantum information processing.
• Current methods using nanophotonic structures face fabrication and integration challenges, especially in materials like diamond.
• Suspended devices are typically required for phononic localization, limiting device design and performance.

Purpose of the Study:

• To develop an alternative optomechanical platform using a semiconductor-on-diamond structure.
• To achieve co-localization of optical and mechanical resonances without undercutting.
• To enable strong optomechanical coupling to spin qubits in diamond.

Main Methods:

• Development of a novel semiconductor-on-diamond platform.
• Design of an optomechanical crystal cavity.
• Characterization of optomechanical coupling and dissipation.

Main Results:

• The platform successfully co-localizes phononic and photonic modes without requiring suspended structures.
• The designed optomechanical crystal cavity exhibits high optomechanical coupling and low dissipation.
• Demonstrated potential for optomechanical coupling to spin qubits within the diamond substrate.

Conclusions:

• The semiconductor-on-diamond platform offers a promising route for advanced quantum information processing.
• This approach overcomes fabrication limitations associated with traditional suspended optomechanical devices.
• The platform facilitates integrated quantum devices leveraging spin, phonon, and photon interactions.