Quantum Key Recycling with Optimal Key Recycling Rate based on Error Rate

TL;DR

This paper introduces a quantum key recycling protocol that adapts to channel noise, optimizing key reuse based on error rates, and demonstrates higher efficiency and security compared to existing methods.

Contribution

A novel quantum key recycling protocol that dynamically adjusts to error rates, achieving optimal key recycling efficiency with proven universal composable security.

Findings

Higher key recycling efficiency than existing protocols

Secure under universal composable security framework

Effective noise tolerance in quantum channels

Abstract

We propose a new Quantum Key Recycling (QKR) protocol, which can tolerate the noise in the quantum channel. Our QKR protocol recycles the used keys according to the error rate. The key recycling rate of the pre-shared keys in our QKR protocol is optimized depending on the real error rate in the quantum channel. And our QKR protocol has higher efficiency than the exiting QKR protocol with error-tolerance. The security proof shows the security of the recycled keys is universal composable.