Efficient entanglement concentration for three-photon W states with parity check measurement

TL;DR

This paper introduces an efficient entanglement concentration protocol for three-photon W states using parity check measurements, enhancing success probability and reusability in quantum information tasks.

Contribution

It proposes an optimal entanglement concentration method for arbitrary less-entangled W states utilizing parity check measurements, with iterative steps to maximize success probability.

Findings

Achieves higher success probability in entanglement concentration

Allows re-concentration of lesser-entangled states

Potentially optimal protocol for three-photon W states

Abstract

We present an optimal entanglement concentration ECP for an arbitrary less-entangled W state. By two of the parties say Alice and Charlie performing one parity check measurements, they can obtain the maximally entangled W state with a certain probability. Otherwise, they can obtain another lesser-entangled W state with another probability, which can be used to reconcentrated into a maximally entangled W state. By iterating this ECP several times, it has the maximal success probability. This ECP maybe an optimal one and is useful in current quantum information processing.