Experimental distillation of bi-partite polarization entanglement using polarizing Mach-Zehnder interferometers

TL;DR

This paper introduces a method for distilling bipartite polarization entanglement using interferometry, optimizing entanglement extraction from pure or mixed states, with experimental validation showing increased Bell inequality violations.

Contribution

It presents a novel interferometric technique for entanglement distillation that enhances entanglement quality in bipartite quantum states.

Findings

Distilled states show increased Bell inequality violations.

Experimental results confirm the effectiveness of the interferometric method.

The technique works for both pure and mixed entangled states.

Abstract

Entanglement distillation is the process of concentrating entanglement from a given quantum state. We present a technique for distillation of bi-partite polarization entanglement using interferometry. This technique can be optimized to extract maximal entanglement from any pure or mixed entangled state. A model for this method is presented and in particular we present experimental results for pure states when using polarizing Mach-Zehnder interferometers. These experimentally distilled states always demonstrate an increased violation of Bell's inequality.