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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.