Efficient W state entanglement concentration using quantum-dot and optical microcavities

TL;DR

This paper introduces a new entanglement concentration protocol for less-entangled W states using quantum-dot and microcavity systems, leveraging quantum nondemolition measurements and single photons to improve success probability.

Contribution

The protocol uniquely employs quantum-dot microcavity systems and single photons for efficient entanglement concentration of W states, with repeatability for higher success rates.

Findings

Protocol achieves higher success probability through repetition.

Uses quantum nondemolition measurement for parity check.

Applicable to current quantum information processing systems.

Abstract

We present an entanglement concentration protocols (ECPs) for less-entangled W state with quantum-dot and microcavity coupled system. The present protocol uses the quantum nondemolition measurement on the spin parity to construct the parity check gate. Different from other ECPs, this less-entangled W state with quantum-dot and microcavity coupled system can be concentrated with the help of some single photons. The whole protocol can be repeated to get a higher success probability. It may be useful in current quantum information processing.