Experimental generation of an eight-photon Greenberger-Horne-Zeilinger state
Experimental generation of an eight-photon Greenberger-Horne-Zeilinger state
复制标题
八光子 Greenberger-Horne-Zeilinger 态的实验生成
DOI：
10.1038/ncomms1556
复制
发表时间：
2011-11-01
影响因子：
16.6
通讯作者：
Guo, Guang-Can
中科院分区：
文献类型：
--
作者：
Huang, Yun-Feng;Liu, Bi-Heng;Guo, Guang-Can
多体纠缠态对于量子网络和量子计算的研究具有重要意义。迄今为止，成功操纵的粒子数量最多的是14个捕获的离子。然而，在量子信息科学中，光子比其他系统具有特殊的优势。特别是，它们是更容易传输的量子比特，并且对退相干更鲁棒。到目前为止，在实验中成功操纵的最大光子数是6个。在这里，我们第一次证明了一个八光子Greenberger-Horne-Zeilinger态，测量保真度为0.59 +/- 0.02，这证明了真正的八体纠缠的存在。这是通过使用300 mW泵浦激光器将光子探测效率提高到25%来实现的。在这种状态下，我们还演示了一个八方量子通信复杂性场景。这种八光子纠缠态源在单向量子计算、量子网络和其他量子信息处理任务中可能是有用的。
Multi-partite entangled states are important for developing studies of quantum networking and quantum computation. To date, the largest number of particles that have been successfully manipulated is 14 trapped ions. Yet in quantum information science, photons have particular advantages over other systems. In particular, they are more easily transportable qubits and are more robust against decoherence. Thus far, the largest number of photons to have been successfully manipulated in an experiment is six. Here we demonstrate, for the first time, an eight-photon Greenberger-Horne-Zeilinger state with a measured fidelity of 0.59 +/- 0.02, which proved the presence of genuine eight-partite entanglement. This is achieved by improving the photon detection efficiency to 25% with a 300-mW pump laser. With this state, we also demonstrate an eight-party quantum communication complexity scenario. This eight-photon entangled-state source may be useful in one-way quantum computation, quantum networks and other quantum information processing tasks.