Integrated measurement server for measurement-device-independent quantum key distribution network

Area of Science:

• Quantum Information Science
• Optoelectronics
• Quantum Cryptography

Background:

• Quantum key distribution (QKD) offers theoretical unconditional security.
• Measurement-device-independent (MDI)-QKD addresses security vulnerabilities in detection.
• Practical QKD deployment is hindered by scalability, stability, cost, and loss issues.

Purpose of the Study:

• To propose and demonstrate an integrated photonic chip for a star-topology quantum access network.
• To address the limitations of current QKD systems for practical applications.

Main Methods:

• Utilized femtosecond laser direct writing techniques to fabricate integrated circuits.
• Developed an integrated server incorporating multiple Bell state analyzer structures on a single photonic chip.
• Integrated 10 Bell state analyzer structures onto one photonic chip.

Main Results:

• Successfully demonstrated a star-topology quantum access network with an integrated server.
• Achieved high-visibility Bell state analysis using the integrated photonic chip.
• The integrated server shows promise for practical MDI-QKD network applications.

Conclusions:

• The developed integrated photonic server offers a viable solution for scalable and stable MDI-QKD networks.
• Femtosecond laser direct writing enables compact integration of QKD components.
• This platform advances the practical implementation of secure quantum communication networks.