A Study of Channel Estimation and Postprocessing in Quantum Key Distribution Protocols

TL;DR

This paper introduces improved channel estimation and postprocessing techniques for quantum key distribution protocols, resulting in higher key generation rates compared to traditional methods.

Contribution

It proposes a novel channel estimation method using transmitted and received bit sequences and a new two-way classical communication postprocessing approach.

Findings

Higher key generation rates achieved with proposed methods

Enhanced channel estimation accuracy

Improved postprocessing efficiency

Abstract

This thesis investigate the channel estimation and the postprocessing of the quantum key distribution protocols. In particular, we propose a new channel estimation procedure, in which we utilize the bit sequences transmitted and received by different bases, and a new postprocessing with two-way classical communication. Then, we show that the key generation rates of the QKD protocols with our channel estimation and/or our postprocessing are higher than those with conventional ones.