Entanglement recovery in noisy binary quantum information protocols via three-qubit quantum error correction codes

TL;DR

This paper explores how three-qubit quantum error correction codes can recover entanglement and enhance quantum communication protocols like superdense coding and teleportation under noisy conditions.

Contribution

It demonstrates that simple three-qubit QEC codes can prevent entanglement sudden death and improve protocol performance even with significant noise levels.

Findings

QEC codes restore entanglement in noisy environments

They prevent entanglement sudden death

Performance of quantum protocols improves with QEC under noise

Abstract

The task of preserving entanglement against noises is of crucial importance for both quantum communication and quantum information transfer. To this aim, quantum error correction (QEC) codes may be employed to compensate, at least partially, the detriments induced by environmental noise that can be modelled as a bit-flip or a phase-flip error channel. In this paper we investigate the effects of the simple three-qubit QEC codes to restore entanglement and nonlocality in a two-qubit system and consider two practical applications: superdense coding and quantum teleportation. Though the considered three-qubit QEC codes are known to perfectly work in the presence of very small noise, we show that they can avoid the sudden death of entanglement and improve the performance of the addressed protocols also for larger noise amplitudes.