Protection of quantum information and optimal singlet conversion through higher dimensional quantum systems and environment monitoring

TL;DR

This paper demonstrates how higher-dimensional quantum systems combined with environment monitoring and feedback can fully protect quantum information and optimize entanglement conversion, enhancing quantum communication and memory protocols.

Contribution

It introduces a method using three-level systems and environment monitoring to deterministically protect quantum information and implement optimal singlet conversion.

Findings

Full protection of quantum information achieved with environment monitoring

Environment monitoring physically implements optimal singlet conversion

Potential improvements in quantum communication resources and distances

Abstract

We study how to protect quantum information in quantum systems subjected to local dissipation. We show that combining the use of three-level systems, environment monitoring, and local feedback can fully and deterministically protect any available quantum information, including entanglement initially shared by different parties. These results can represent a gain in resources and/or distances in quantum communication protocols such as quantum repeaters and teleportation as well as time for quantum memories. Finally, we show that monitoring local environments physically implements the optimum singlet conversion protocol, essential for classical entanglement percolation.