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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Measurement device-independent quantum key distribution with vector vortex modes under diverse weather conditions
Comfort Sekga1, Mhlambululi Mafu2
1Department of Physics and Astronomy, Botswana International University of Science and Technology, P/Bag 16, Palapye, Botswana.
Scientific Reports
|September 11, 2023
Summary
This study introduces measurement device-independent quantum key distribution using vector vortex modes, achieving secure key transmission over 178 km. This approach enhances security and practical feasibility for quantum communications in various weather conditions.
Area of Science:
- Quantum Information Science
- Optical Communications
- Quantum Cryptography
Background:
- Conventional quantum key distribution (QKD) setups using orbital angular momentum beams are vulnerable to detector side-channel attacks.
- Optical beams in QKD experience spatial aberrations from atmospheric turbulence and adverse weather, limiting transmission distances and reliability.
Purpose of the Study:
- To introduce and investigate a measurement device-independent QKD (MDI-QKD) protocol utilizing vector vortex modes.
- To assess the performance of vector vortex modes compared to scalar beams in turbulent atmospheric channels under various weather conditions.
Main Methods:
- Implementation of MDI-QKD using vector vortex modes.
- Simulation and analysis of beam transmission through a simulated turbulent atmospheric link.
- Evaluation of secure key transmission distances under clear, rainy, and hazy conditions.
Main Results:
- A maximum secure key transmission distance of 178 km was achieved using vector vortex beams under clear conditions.
- Secure transmission distances of 152 km (rain) and 160 km (haze) were demonstrated, showing resilience to weather.
- Vector vortex modes showed comparable performance to scalar beams despite atmospheric disturbances.
Conclusions:
- Vector vortex modes offer a promising avenue for robust and secure MDI-QKD.
- This research demonstrates the feasibility of practical secure quantum communications over significant distances, even in challenging weather.
- The findings pave the way for more secure and reliable quantum communication networks.
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