Security analysis of simultaneous classical communication and CVQKD with a local local oscillator under the phase reference pulse intensity attack

Area of Science:

• Quantum Communication
• Information Security

Background:

• Simultaneous classical and continuous variable quantum communication (CVQKD) offers cost-effective integration.
• Existing schemes using local local oscillators (LLO CVQKD) have security vulnerabilities due to reference pulses.

Purpose of the Study:

• To analyze and simulate the security performance of simultaneous communication systems under phase reference pulse intensity attacks.
• To propose a novel reconstructed noise model to mitigate identified security loopholes.

Main Methods:

• Introduction of a trusted noise model to simulate eavesdropper (Eve) attacks.
• Analysis of Eve's ability to manipulate reference pulse intensity using phase-insensitive amplifiers.
• Development and simulation of a reconstructed noise model.

Main Results:

• The trusted noise model effectively simulates attacks exploiting reference pulse intensity.
• The proposed reconstructed noise model demonstrates the capability to close security loopholes.
• Simulations confirm that the reconstructed noise model strengthens the security of practical systems.

Conclusions:

• The reconstructed noise model provides a robust solution to enhance the security of simultaneous LLO CVQKD systems.
• This work contributes to the development of more secure integrated quantum communication architectures.