Spatially Adiabatic Frequency Conversion in Optoelectromechanical Arrays.

Area of Science:

• Quantum physics
• Quantum optics
• Quantum computing

Background:

• Quantum signal conversion between microwave and optical frequencies is essential for quantum networks.
• Optoelectromechanical systems offer a promising approach for this conversion.
• Current methods using mechanically dark modes have limited conversion bandwidth.

Purpose of the Study:

• To overcome the bandwidth limitations in optoelectromechanical quantum signal conversion.
• To develop a novel strategy for efficient and low-noise quantum transduction.
• To enhance the feasibility of quantum networks utilizing superconducting circuits.

Main Methods:

• Utilizing an array of optoelectromechanical transducers.
• Spatially varying coupling rates within the array.
• Employing an adiabatically changing mechanically dark mode for microwave-to-optical conversion.

Main Results:

• Achieved conversion bandwidth exceeding the cavity linewidth.
• Demonstrated significantly reduced thermal noise.
• Observed largest bandwidth enhancement in smaller arrays, ideal for current experiments.

Conclusions:

• The proposed array system effectively overcomes bandwidth limitations in quantum signal transduction.
• The method offers a pathway to improved quantum network performance.
• The findings are particularly relevant for advancing state-of-the-art experimental quantum technologies.