Adcock Jeremy C, Vigliar Caterina, Santagati Raffaele, Silverstone Joshua W, Thompson Mark G
Quantum Engineering Technology (QET) Labs, H. H. Wills Physics Laboratory & School of Computer, Electronic Engineering & Engineering Mathematics, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol, BS8 1UB, UK.
Nat Commun. 2019 Aug 6;10(1):3528. doi: 10.1038/s41467-019-11489-y.
Future quantum computers require a scalable architecture on a scalable technology-one that supports millions of high-performance components. Measurement-based protocols, using graph states, represent the state of the art in architectures for optical quantum computing. Silicon photonics technology offers enormous scale and proven quantum optical functionality. Here we produce and encode photonic graph states on a mass-manufactured chip, using four on-chip-generated photons. We programmably generate all types of four-photon graph state, implementing a basic measurement-based protocol, and measure high-visibility heralded interference of the chip's four photons. We develop a model of the device and bound the dominant sources of error using Bayesian inference. The combination of measurement-based quantum computation, silicon photonics technology, and on-chip multi-pair sources will be a useful one for future scalable quantum information processing with photons.
未来的量子计算机需要一种基于可扩展技术的可扩展架构，该技术要能支持数百万个高性能组件。基于测量的协议利用图态，代表了光量子计算架构的当前技术水平。硅光子技术具有巨大的规模且具备经过验证的量子光学功能。在此，我们利用四个片上产生的光子，在大规模制造的芯片上制备并编码光子图态。我们通过编程生成所有类型的四光子图态，实现一个基本的基于测量的协议，并测量芯片上四个光子的高可见度预示干涉。我们开发了该器件的模型，并使用贝叶斯推理来界定主要误差源。基于测量的量子计算、硅光子技术和片上多对源的结合，对于未来基于光子的可扩展量子信息处理将是有用的。
