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FL-QKD based on optical-THz biphotons generated by spontaneous parametric downconversion in inter-satellite wireless
Applied Optics
|October 6, 2021
Summary
We introduce wireless Floodlight Quantum Key Distribution (FL-QKD) for satellite links. This terahertz-band protocol achieves a 50 Mbps secret key rate over 200 km, enabling secure global quantum communication.
Area of Science:
- Quantum Information Science
- Quantum Communication
- Free-Space Optics
Background:
- Floodlight Quantum Key Distribution (FL-QKD) offers high secret key rates (SKR) over fiber links.
- Existing QKD protocols face limitations in long-distance, high-bandwidth applications.
Purpose of the Study:
- To propose and analyze a novel wireless FL-QKD protocol operating in the terahertz (THz) frequency bands for inter-satellite communication.
- To evaluate the security and performance of THz-FL-QKD against sophisticated eavesdropping strategies.
Main Methods:
- Development of a two-way THz-FL-QKD protocol utilizing forward and backward channels for quantum signal transmission and detection.
- Security analysis against individual and optimum collective attacks.
- Numerical simulations to assess the secret key rate (SKR) and performance over inter-satellite links.
Main Results:
- Demonstration of a 50 Mbps SKR for THz-FL-QKD at 10 THz over a 200 km wireless inter-satellite link.
- Validation of the protocol's security against theoretical attacks.
- Feasibility of high-speed quantum key distribution in free-space environments.
Conclusions:
- THz-FL-QKD presents a viable solution for high-speed, secure quantum communication in space.
- This protocol can significantly advance the development of global quantum networks.
- The study paves the way for future high-bandwidth quantum communication systems.
