An opto-magneto-mechanical quantum interface between distant superconducting qubits.

Area of Science:

• Quantum Information Science
• Quantum Networking
• Opto-mechanical Systems

Background:

• A quantum internet requires coherent connections between widely separated quantum devices.
• Superconducting quantum devices offer advanced local quantum engineering capabilities.
• Coherent optical quantum interconnection between distant superconducting devices remains a significant challenge.

Purpose of the Study:

• To propose and analyze a concrete system for high-fidelity microwave-to-optical quantum information interconversion.
• To demonstrate a viable method for connecting distant superconducting quantum devices via optical links.

Main Methods:

• Utilized an opto-magneto-mechanical system integrating superconducting flux qubits and optical cavities.
• Employed magnetic fields from supercurrents of a flux qubit to modulate a high-Q mechanical oscillator within an optical cavity.
• Analyzed quantum information transfer fidelity between two spatially distant nodes connected by optical fiber.

Main Results:

• Achieved high-fidelity microwave-to-optical quantum information exchange through the proposed system.
• Predicted transfer fidelity of approximately 80% between distant nodes, even with substantial optical loss.
• Demonstrated the potential for robust quantum information transfer over optical fiber links.

Conclusions:

• The described opto-magneto-mechanical system provides a concrete pathway for high-fidelity quantum information interconversion.
• This approach is a vital step towards realizing a functional quantum internet utilizing superconducting devices.
• The predicted high fidelity suggests feasibility with currently accessible experimental parameters.