High-speed physical key distribution based on dispersion-shift-keying chaos synchronization in commonly driven...

Area of Science:

• Optoelectronics
• Quantum Information Science
• Applied Physics

Background:

• Physical key distribution (PKD) is crucial for secure communication.
• Existing PKD methods face challenges in speed and security.
• Chaos synchronization in semiconductor lasers offers a promising avenue for high-speed PKD.

Purpose of the Study:

• To propose and numerically demonstrate a novel high-speed physical key distribution scheme.
• To enhance the security of key distribution using dispersion-induced nonlinear transformations.
• To achieve high-speed synchronization in a simplified laser configuration.

Main Methods:

• Utilizing dispersion-shift-keying (DSK) chaos synchronization between a drive laser and two response lasers.
• Implementing an open-loop synchronization configuration with commonly driven lasers without external feedback.
• Numerically simulating the system to evaluate key distribution speed and bit error ratio.

Main Results:

• Achieved a secure key distribution rate of 1.2 Gb/s.
• Demonstrated a bit error ratio (BER) below 3.8×10^-3.
• Dispersion introduced nonlinear transformation, eliminating correlation and enhancing security.
• Short synchronization recovery time (sub-nanosecond) enabled high-speed operation.

Conclusions:

• The proposed DSK chaos synchronization scheme offers a viable solution for high-speed and secure physical key distribution.
• The open-loop configuration and dispersion-induced nonlinearity are key to the system's performance and security.
• This method paves the way for practical implementation of ultra-fast secure communication systems.