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

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.

9 pages, 6 figures

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• Deterministic Local Expansion of W States
• Systematic entanglement concentration for unknown less-entangled three-photon W states
• Efficient electronic entanglement concentration assisted with single mobile electron
• Optimal multipartite entanglement concentration of electron-spin states based on charge detection and projection measurements
• Measurement of arbitrary two-photon entanglement state with the photonic Faraday rotation
• Maximal entanglement concentration for $(n+1)$-qubit states