Optically Heralded Entanglement of Superconducting Systems in Quantum Networks

Area of Science:

• Quantum Information Science
• Quantum Networking
• Superconducting Quantum Computing

Background:

• Networking superconducting quantum computers presents significant challenges.
• Traditional methods rely on cascaded transducers, facing issues with low coupling efficiency and added noise.
• Existing approaches struggle with the rate-fidelity trade-off in quantum communication.

Purpose of the Study:

• To introduce a novel optical networking protocol for superconducting quantum computers.
• To overcome the limitations of cascaded transduction in quantum networks.
• To enhance entanglement generation and simplify connectivity between quantum devices.

Main Methods:

• Utilizing optical networking via heralding end-to-end entanglement.
• Employing a single detected photon and quantum teleportation.
• Implementing the protocol on standard transduction hardware.

Main Results:

• The proposed scheme significantly improves performance over traditional transduction methods.
• It effectively absorbs low optical-microwave coupling efficiency into the heralding step.
• The protocol breaks the detrimental rate-fidelity trade-off inherent in cascaded transduction.

Conclusions:

• This new protocol offers a more efficient and robust way to network superconducting quantum computers.
• It simplifies entanglement generation between superconducting devices and other quantum modalities.
• The method paves the way for more scalable and performant quantum networks.