量子网络中的决定性多量子位纠
Youpeng Zhong1,2, Hung-Shen Chang1, Audrey Bienfait1,3
1Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, USA.
Nature
|February 25, 2021
概括
研究人员开发了一个连接超导量子处理器的量子网络. 这一突破使得确定性的多量子位纠分布成为可扩展的量子计算和通信网络的关键.
科学领域:
- 量子信息科学
- 量子计算
- 量子通信网络
背景情况:
- 对于量子网络来说,高保真度的分布式多量子位纠是必不可少的.
- 之前的决定性纠演示仅限于两个量子位.
- 在状态传输忠实性方面的挑战阻碍了多量子位纠分布.
研究的目的:
- 在超导量子节点之间证明量子状态的决定性转移.
- 准备和传输多量子位纠状态,特别是格林伯格-霍恩-齐林格 (GHZ) 状态.
- 为大规模量子计算建立一个模块化架构.
主要方法:
- 通过同轴电缆连接两个超导节点构建了一个量子网络.
- 每个节点包含三个相互连接的超导量子位.
- 通过连接电缆实现了直接的量子比特到量子比特状态传输.
主要成果:
- 在节点之间实现了0.911±0.008的状态传输过程保真性.
- 成功转移了0.656±0.014的三量子比特GHZ状态.
- 产生一个六量子比特,两个节点的GHZ状态,具有0.722±0.021的保真度,超过多方纠值.
结论:
- 开发的量子网络架构可以连接超导量子处理器.
- 在物理链路上证明了决定性的多量子位纠分布.
- 提供了一个可行的模块化方法来构建大型量子计算机.
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