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Logic W-state concentration with parity check

机译：与奇偶校验逻辑W-state浓度

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摘要

Logic W state, which replaces each physical qubit in a W state with a Greenberger-Horne-Zeilinger state is robust against photon transmission loss in long-distance quantum communication. In practical application, the environmental noise may make maximally entangled logic W state degrade to less entangled state, which largely limits its application. In this article, we propose an efficient entanglement concentration protocol (ECP) for logic W state, which can recover the less entangled logic W state into the maximally entangled logic W state. Our ECP relies on the nondemolition polarization parity check (PPC) gate constructed with cross-Kerr nonlinearity. The distilled maximally entangled logic W state can be preserved for other application. Moreover, when the ECP fails, we can repeat the ECP to further concentrate the distilled less entangled logic W state. By repeating the ECP, the total success probability can be effectively increased. Based on above features, this ECP may be useful in quantum communication field.
机译：逻辑W状态,每个物理量子位取代Greenberger-Horne-Zeilinger W状态对光子传输损耗状态是健壮的在远距离量子通信。实际应用时,环境噪声可以最大限度地纠缠W态逻辑很大程度上降低少纠缠态限制了其应用。提出一种有效的缠结浓度逻辑W状态协议(ECP),可以恢复纠缠W态逻辑到越少最大限度地纠缠W态逻辑。nondemolition极化奇偶校验(PPC)由cross-Kerr门非线性。可以保存为其他逻辑W状态应用程序。重复该项目进一步集中蒸馏少纠缠W态逻辑。重复该项目,成功概率可以有效地增加。在量子特性,这个项目可能是有用的通信领域。

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