# Autonomous recognition of erroneous raw key bit bias in quantum key distribution

## TL;DR

This paper introduces a method to automatically detect and correct errors in quantum key distribution systems, improving their security and reliability.

## Contribution

The paper presents a novel autonomous mechanism to detect and mitigate raw key bit bias errors in quantum key distribution.

## Key findings

- An abstract definition of raw key bit bias errors and their impact on QKD protocols is provided.
- A two-part autonomous countermeasure is proposed to mitigate these errors.
- Simulated results and practical examples demonstrate the relevance of addressing this error type.

## Abstract

As quantum key distribution technologies mature, it is pertinent to consider these systems in contexts beyond lab settings, and how these systems may have to operate autonomously. To begin, an abstract definition of a type of error that can occur with regard to the ratio of bit values in the raw key is presented, and how this has an impact on the security and key rate of QKD protocols. A mechanism by which errors of this type can be autonomously recognised is given, along with simulated results. A two part countermeasure that can be autonomously put in place to mitigate against errors of this type is also given. Finally some motivating examples where this type of error could appear in practice are presented to add context, and to illustrate the importance of this work to the development of quantum key distribution technologies.