Practical scheme for non-postselection entanglement concentration using linear optical elements

TL;DR

This paper presents a practical linear optical scheme for entanglement concentration that produces maximally entangled Bell states from partially entangled photon pairs without postselection or photon-number resolving detectors, facilitating quantum information experiments.

Contribution

It introduces a novel, experimentally feasible method for entanglement concentration using only linear optics and no postselection, improving practicality for quantum protocols.

Findings

Produces maximally entangled Bell states from partially entangled pairs

Does not require photon-number resolving detectors

Applicable to various quantum information protocols

Abstract

We report a practical non-postselection entanglement concentration scheme in which a maximally entangled Bell-state photon pair is produced from two pairs of partially (or non-maximally) entangled photons. Since this scheme is built only upon linear optical elements and does not require photon-number resolving detectors, it has immediate applications in experimental implementations of various quantum information protocols which require two-photon Bell-states.