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Free Space Measurement Device Independent Quantum Key Distribution with Modulating Retro-Reflectors under Correlated

Xingyu Wang^1,2, Wei Liu¹, Tianyi Wu¹

¹Information and Communication College, National University of Defense Technology, Xi'an 710006, China.

Entropy (Basel, Switzerland)

|October 23, 2021

Summary

This study introduces a quantum key distribution system using a modulating retro-reflector (MRR) for secure satellite communication. The novel design simplifies setup and enhances security in dynamic, turbulent environments.

Keywords:

MDI-QKD atmosphere turbulence double-pass channel modulating retro-reflector

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Area of Science:

Quantum Information Science
Optical Communication Systems
Satellite Technology

Background:

Modulating retro-reflectors (MRR) reduce ground station requirements for laser communication.
Measurement device independent quantum key distribution (MDI-QKD) eliminates detector side-channel attacks.
Practical QKD systems face challenges with polarization drift and atmospheric turbulence.

Purpose of the Study:

To propose a plug-and-play MDI-QKD scheme incorporating MRR for flexible, moving scenarios.
To simplify QKD setup requirements for satellite communication.
To analyze the security and feasibility of the proposed scheme under atmospheric turbulence.

Main Methods:

Implementation of a plug-and-play architecture to compensate for polarization drift.
Integration of MRR to reduce terminal requirements.
Development of a double-pass correlated turbulent channel model for performance analysis.
Security analysis against classical attacks.

Main Results:

The proposed scheme effectively eliminates detector side channels and allows untrusted satellite relays.
The plug-and-play architecture ensures superior performance on free-space channels.
System performance deteriorates with increased fading correlation and turbulence intensity.
The scheme demonstrates feasibility for MDI-QKD on moving platforms.

Conclusions:

The MRR-enhanced MDI-QKD scheme offers a simplified and secure solution for satellite quantum communication.
The system is viable for dynamic quantum networks utilizing untrusted relays.
Further research can optimize performance under challenging atmospheric conditions.