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More optimal relativistic quantum key distribution.

Georgi Bebrov¹

¹Telecommunications Department, Technical University of Varna, 9010, Varna, Bulgaria. g.bebrov@tu-varna.bg.

Scientific Reports

|September 13, 2022

Summary

This summary is machine-generated.

This study introduces two novel relativistic quantum key distribution (QKD) schemes using high-dimensional systems. One scheme achieves the highest secret key rate for QKD, while the other offers longer distances with a high rate.

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Area of Science:

Quantum Cryptography
Information Security
Quantum Information Science

Background:

Designing optimal quantum key distribution (QKD) schemes is a significant challenge.
Relativistic QKD offers enhanced security by integrating quantum phenomena and relativity.
Existing relativistic QKD schemes often lack optimality in efficiency and secret key rate.

Purpose of the Study:

To propose and implement two novel point-to-point relativistic quantum key distribution (QKD) schemes.
To enhance the efficiency and secret key rate of relativistic QKD protocols.
To introduce a new metric for evaluating QKD scheme optimality.

Main Methods:

Implementation of two relativistic QKD schemes using weak coherent pulses.
Utilization of high-dimensional quantum systems with phase and polarization encodings.
Sequential interferometer setup and a modified classic relativistic QKD setup.

Main Results:

Both proposed schemes demonstrate high secret key rates without compromising security.
One scheme achieves the highest secret key rate among all relativistic QKD protocols (up to 150 km).
The other scheme offers a lower secret key rate but extends operating distances to 320 km.
A novel optimality metric is proposed, showing one scheme is superior to existing relativistic and twin-field QKD protocols.

Conclusions:

The developed relativistic QKD schemes significantly improve secret key rates and efficiency.
One scheme is identified as the most optimal relativistic key distribution, outperforming twin-field QKD for shorter distances.
The research contributes to advancing secure communication through practical and efficient QKD implementations.