Distilling Entanglement with Noisy Operations

TL;DR

This paper analyzes how noisy quantum operations affect entanglement distillation, identifying four key noise classes and providing insights to improve practical distillation protocols under realistic conditions.

Contribution

It classifies noise types into four equivalence classes affecting distillability, aiding practical improvements in entanglement distillation with noisy operations.

Findings

Four noise classes identified affecting distillability

Classes are connected by local unitary transformations

Results applicable to real-world quantum systems

Abstract

Entanglement distillation is a fundamental task in quantum information processing. It not only extracts entanglement out of corrupted systems but also leads to protecting systems of interest against intervention with environment. In this work, we consider a realistic scenario of entanglement distillation where noisy quantum operations are applied. In particular, the two-way distillation protocol that tolerates the highest error rate is considered. We show that among all types of noise there are only four equivalence classes according to the distillability condition. Since the four classes are connected by local unitary transformations, our results can be used to improve entanglement distillability in practice when entanglement distillation is performed in a realistic setting.