News Release

纠缠、交换、净化、重复

Peer-Reviewed Publication

American Association for the Advancement of Science (AAAS)

Entangle, Swap, Purify, Repeat: Enhancing Connections Between Distant Nodes

image: Art image illustrating the concept of entanglement distillation between spins in diamond. This material relates to a paper that appeared in the June 2, 2017, issue of Science, published by AAAS. The paper, by N. Kalb at QuTech in Delft, Netherlands, and colleagues was titled, "Entanglement distillation between solid-state quantum network nodes." view more 

Credit: Cheyenne Hensgens

科学家们推出了一项协议,它能增进量子纠缠,从而证实了它在2米距离中的有效性。这一进展标志着一种被称作纠缠蒸馏技术的成功证明,纠缠蒸馏是在近20年前首次被开发的。量子纠缠是一种物理现象,即在跨越某一距离时各粒子间的相互关联(或“联系”在一起),量子纠缠对安全通信、量子计算和模拟及得到增强的计量学具有重要意义。然而,粒子与环境之间无法避免的相互作用会破坏纠缠,因此必须考虑这些相互作用并加以校正。为了克服这一难题,Norbert Kalb等使用了2个钻石芯片(各自组成了一个氮空位电子自旋,它被用作“通信”量子位元)及一个附近的碳-13原子核自旋,后者被用作一个“记忆”量子位元(这类记忆位元不会受到光跃迁的影响)。首先,这些通信位元不受原始纠缠态的影响,后者接着被替换至记忆位元。通信位元的第一个原始纠缠态一旦被投射到记忆位元,它接着又可自由地呈现另一个原始纠缠态。记忆位元容易失去由通信位元给予的初始态,因此研究人员研发了一种实时监控记忆粒子的方法。该科学家团队能解释并校正存在于通信位元间的任何错误,并因此增进了每次迭代时的量子纠缠。

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