在光学网络链路上分布式量子计算
D Main1, P Drmota2, D P Nadlinger2
1Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK. dougal.main@physics.ox.ac.uk.
Nature
|February 5, 2025
概括
研究人员展示了两个被困离子模块之间的确定性量子门传输, 使分布式量子计算成为可能. 这一突破使得可扩展的量子网络和复杂的量子算法可以在很长的距离上运行.
科学领域:
- 量子信息科学
- 量子计算
- 量子网络
背景情况:
- 分布式量子计算 (DQC) 旨在通过网络化量子处理模块来增强计算能力.
- 光子网络为DQC提供可重新配置的互连,通过量子门传输 (QGT) 实现逻辑连接.
- 对于可扩展的DQC架构来说,确定性和可重复性QGT至关重要,但此前尚未实现.
研究的目的:
- 通过实验证明光子互连的被困离子模块之间的量子计算分布.
- 为了实现可扩展的DQC,
- 实现分布式量子算法和操作.
主要方法:
- 使用两个被困离子模块相隔约两米, 每个都有专门的网络和电路量子位.
- 使用网络量子位之间的远程纠来决定性地传输受控Z (CZ) 门.
- 执行格罗弗的搜索算法,并使用多个QGT实例分布iSWAP/SWAP电路.
主要成果:
- 在单独模块中的电路量子位之间实现了CZ门的86%的确定性传输.
- 证明了格罗弗的搜索算法的71%成功率, 这是第一个使用非本地门的分布式量子算法.
- 成功实现了分布式iSWAP和SWAP电路,展示了任意的两个量子比特操作的分布.
结论:
- 展示的DQC架构为大规模量子计算提供了可行的途径.
- 在被困离子系统中,使用光子互连的确定性QGT是可以实现的.
- 这种方法支持未来量子计算进步的一系列物理平台.
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