Enomoto Yutaro, Yonezu Kazuma, Mitsuhashi Yosuke, Takase Kan, Takeda Shuntaro
Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
Sci Adv. 2021 Nov 12;7(46):eabj6624. doi: 10.1126/sciadv.abj6624.
A quantum processor to import, process, and export optical quantum states is a common core technology enabling various photonic quantum information processing. However, there has been no photonic processor that is simultaneously universal, scalable, and programmable. Here, we report on an original loop-based single-mode versatile photonic quantum processor that is designed to be universal, scalable, and programmable. Our processor can perform arbitrarily many steps of programmable quantum operations on a given single-mode optical quantum state by time-domain processing in a dynamically controlled loop-based optical circuit. We use this processor to demonstrate programmable single-mode Gaussian gates and multistep squeezing gates. In addition, we prove that the processor can perform universal quantum operations by injecting appropriate ancillary states and also be straightforwardly extended to a multimode processor. These results show that our processor is programmable, scalable, and potentially universal, leading to be suitable for general-purpose applications.
一种用于导入、处理和输出光量子态的量子处理器是实现各种光子量子信息处理的通用核心技术。然而，目前还没有同时具备通用性、可扩展性和可编程性的光子处理器。在此，我们报告一种基于环路的原创单模通用光子量子处理器，其设计具备通用性、可扩展性和可编程性。我们的处理器能够通过在动态控制的基于环路的光学电路中进行时域处理，对给定的单模光量子态执行任意多步的可编程量子操作。我们使用该处理器演示了可编程单模高斯门和多步压缩门。此外，我们证明通过注入适当的辅助态，该处理器能够执行通用量子操作，并且还能直接扩展为多模处理器。这些结果表明我们的处理器具有可编程性、可扩展性且潜在地具有通用性，适合用于通用应用场景。
