Distillation of genuine mixed state for quantum communications

TL;DR

This paper introduces a practical linear-optics entanglement distillation protocol for genuine mixed states, enhancing the quality of entangled states in quantum communication with current technology.

Contribution

It presents a novel entanglement distillation protocol applicable to both ideal and SPDC sources, improving fidelity and practicality for current quantum communication systems.

Findings

Successfully distills high-quality entangled mixed states

Compatible with current SPDC sources for higher fidelity

Applicable to multi-partite entangled systems

Abstract

We present a practical entanglement distillation protocol (EDP) with linear optics for a genuine mixed state. Each components of the genuine mixed state is a pure less-entangled state. After successfully performing this EDP, we can obtain a high quality entangled mixed state. Our EDP can work for both ideal entanglement sources and current available spontaneous parametric down-conversion (SPDC) sources, which makes it feasible in current experimental technology. Moreover, by using the SPDC source, we can obtain a higher fidelity. This protocol can also be used to distill the multi-partite entangled systems. All the features make it practical and useful in current quantum communications.