1206.5664 (Yu-Bo Sheng et al.)

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

Yu-Bo Sheng, Lan Zhou, Chuan Wang, Sheng-Mei Zhao

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.

View original: http://arxiv.org/abs/1206.5664