Avoiding disentanglement of multipartite entangled optical beams with a correlated noisy channel.
Avoiding disentanglement of multipartite entangled optical beams with a correlated noisy channel.
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DOI：
10.1038/srep44475
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发表时间：
2017-03-15
影响因子：
4.6
通讯作者：
Xie C
中科院分区：
文献类型：
--
作者：
Deng X;Tian C;Su X;Xie C
量子通信网络可以通过将多部分纠缠态分布到空间分离的节点来构建。具有最高飞行速度和可测量亮度的纠缠光束可以用作量子通信网络中传递信息的载体。真实通信信道中存在的损耗和噪声将减少甚至完全破坏纠缠。解纠缠现象将导致量子通信的彻底失败。在这里，我们展示了量子网络中使用的三方纠缠光束的解纠缠和纠缠复兴的实验演示。我们通过实验证明，对称三方纠缠光束在纯有损但无噪声的通道中具有鲁棒性。在噪声信道中，过多的噪声将导致解纠缠，并且可以通过使用相关噪声信道（非马尔可夫环境）来恢复被破坏的纠缠。所提出的结果为建立量子网络提供了有用的技术参考。
A quantum communication network can be constructed by distributing a multipartite entangled state to space-separated nodes. Entangled optical beams with highest flying speed and measurable brightness can be used as carriers to convey information in quantum communication networks. Losses and noises existing in real communication channels will reduce or even totally destroy entanglement. The phenomenon of disentanglement will result in the complete failure of quantum communication. Here, we present the experimental demonstrations on the disentanglement and the entanglement revival of tripartite entangled optical beams used in a quantum network. We experimentally demonstrate that symmetric tripartite entangled optical beams are robust in pure lossy but noiseless channels. In a noisy channel, the excess noise will lead to the disentanglement and the destroyed entanglement can be revived by the use of a correlated noisy channel (non-Markovian environment). The presented results provide useful technical references for establishing quantum networks.