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Related Experiment Video

Updated: Dec 17, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

Subcarrier wave continuous variable quantum key distribution with discrete modulation: mathematical model and

E Samsonov^1,2, R Goncharov³, A Gaidash^3,4

¹ITMO University, Kronverkskiy, 49, Saint Petersburg, 197101, Russia. eosamsonov@itmo.ru.

Scientific Reports

|June 24, 2020

Summary

This study introduces a continuous-variable quantum key distribution protocol using multimode coherent states. The novel system enables secure key distribution over optical channels with up to 9 dB loss.

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Area of Science:

Quantum Information Science
Quantum Cryptography
Optical Communications

Background:

Continuous-variable quantum key distribution (CV-QKD) offers enhanced security over classical methods.
Utilizing multimode coherent states and subcarrier frequencies presents a novel approach to CV-QKD.
Coherent detection with a local oscillator is crucial for signal recovery in optical systems.

Purpose of the Study:

To propose and analyze a novel continuous-variable quantum key distribution protocol.
To investigate the security of the proposed protocol in the finite-size regime.
To determine the practical feasibility and performance limits of the system.

Main Methods:

Generation of multimode coherent states on subcarrier frequencies of the optical spectrum.
Implementation of a coherent detection scheme utilizing carrier wave power as a local oscillator.
Mathematical modeling and security analysis using the finite-size regime and asymptotic equipartition property.

Main Results:

A mathematical model for the proposed CV-QKD scheme was developed.
Security analysis confirmed a lower bound on the secret key rate under specific assumptions.
The system demonstrates the capability to distribute secret keys over channels with up to 9 dB loss, assuming negligible quantum channel noise relative to detector dark counts and restricting eavesdropper to collective attacks.

Conclusions:

The proposed CV-QKD protocol is a viable method for secure key distribution.
Realistic system implementations can achieve secure key distribution over significant channel losses.
The findings pave the way for practical, secure optical communication systems.