Multi-User Measurement-Device-Independent Quantum Key Distribution Based on GHZ Entangled State

Area of Science:

• Quantum Information Science
• Quantum Cryptography
• Quantum Communication Networks

Background:

• The Greenberger-Horne-Zeilinger (GHZ) state is a crucial multi-particle entangled resource in quantum theory.
• Quantum key distribution (QKD) is vital for secure communication, but practical implementations face security and distance limitations.
• Measurement-device-independent QKD (MDI-QKD) enhances security by removing detector vulnerabilities.

Purpose of the Study:

• To propose a flexible, multi-user MDI-QKD scheme utilizing GHZ entangled states.
• To enhance security against sophisticated detection attacks in quantum networks.
• To reduce the overall complexity of quantum network infrastructure.

Main Methods:

• Development of a novel MDI-QKD protocol based on GHZ entangled states.
• Simulation of the proposed scheme to evaluate its performance and security.
• Design of a network expansion strategy for multi-node, multi-user configurations.

Main Results:

• The proposed GHZ-based MDI-QKD scheme demonstrates resilience against detection attacks.
• Simulations confirm a secure communication distance exceeding 280 km between users and the measurement device.
• The scheme effectively reduces the complexity of quantum network setups.

Conclusions:

• The GHZ-based MDI-QKD scheme offers a robust and scalable solution for secure multi-user quantum communication.
• The proposed network expansion method can further increase communication distances in complex network topologies.
• This work advances the practical deployment of secure quantum communication technologies.