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Simple quantum key distribution using a stable transmitter-receiver scheme
Optics Letters
|April 30, 2021
Summary
This study presents a simple, stable quantum key distribution (QKD) system that bypasses complex alignment and environmental compensation. The new QKD method ensures secure key exchange for practical applications.
Area of Science:
- Quantum Information Science
- Applied Physics
- Secure Communications
Background:
- Quantum Key Distribution (QKD) enables secure key exchange but current systems require complex alignment and environmental compensation.
- Widespread adoption of QKD is hindered by the need for simpler, more stable, and cost-effective systems.
Purpose of the Study:
- To implement a simplified and robust Quantum Key Distribution (QKD) system.
- To overcome the challenges of complex self-alignment and environmental disturbances in existing QKD technologies.
Main Methods:
- Development of a stable transmitter-receiver scheme for QKD.
- Testing the system's stability over 48 hours without feedback control.
- Evaluating the secure key rate over a 75 km fiber spool.
Main Results:
- The implemented QKD system demonstrated stability for 48 hours with an average quantum bit error rate below 1%.
- A stable and secure finite key rate of 7.32 kilobits per second was achieved over a 75 km fiber spool.
- The system proved robust against environmental disturbances, simplifying the self-alignment process.
Conclusions:
- The developed QKD implementation offers a promising, stable, and simple alternative for practical QKD systems.
- This simplified QKD approach is particularly suitable for CubeSat and satellite communication platforms.
- The system's long-term stability and secure key rate performance support its viability for future QKD deployments.
