We present two schemes to concentrate unknown partially entangled three-photon W states with weak cross-Kerr nonlinearity. In both schemes, the three distant parities can obtain a maximally entangled W state via local operations and classical communication with a higher success probability that is double that in Xiong and Ye's scheme [J. Opt. Soc. Am. B 28, 2030 (2011)]. The entanglement concentration schemes need only one party's local operations. Our schemes are relatively simple because fewer linear optics elements are used. In addition, our schemes do not need to use sophisticated single-photon detectors, which makes the scheme more feasible with present techniques.
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机译：我们提出了两种方案来集中未知的部分纠缠的三光子W态，并具有弱的交叉Keer非线性。在这两种方案中，三个远距离奇偶校验都可以通过本地操作和经典通信获得最大纠缠的W状态，其成功概率是Xiong and Ye's方案的两倍。选择。 Soc。上午。 B 28，2030（2011）]。纠缠集中方案仅需要一方的本地操作。我们的方案相对简单，因为使用的线性光学元件更少。另外，我们的方案不需要使用复杂的单光子检测器，这使得该方案在现有技术下更加可行。
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