近日，美国麻省理工学院的Dirk Englund&Linsen Li及其研究团队取得一项新进展。 经过不懈努力，他们基于一个CMOS平台实现自旋光子接口异构集成。相关研究成果已于2024年5月29日在国际权威学术期刊《自然》上发表。

该研究团队成功引入了一种模块化的量子片上系统（QSoC）架构，该架构创新地将量子微芯片二维阵列中数千个可独立寻址的锡空穴自旋量子比特，集成到专门设计的低温控制应用集成电路中。他们详细展示了关键的制造步骤和架构子组件，包括通过独特的“锁定-释放”方法实现QSoC的大规模异构集成转移，高通量的自旋量子比特校准和光谱调谐技术，以及高效的自旋态制备和测量技术。

这一QSoC架构支持通过跨自旋光子频率通道的频谱调谐，实现量子存储器阵列的完全连接。基于详尽的测量和设计研究，研究人员发现通过增加量子比特密度、扩大QSoC的有源区，以及构建跨QSoC模块的光网络该架构的功能将得到进一步扩展。

据悉，钻石中的色心已经成为推进量子技术的领先固态平台，满足DiVincenzo标准，最近在密钥分发方面实现了量子优势。蓝图研究表明，使用本地量子通信网络的通用量子计算将需，要数百万个物理量子比特来编码数千个逻辑量子比特，这提出了一个开放的可扩展性挑战。

附：英文原文

Title: Heterogeneous integration of spin–photon interfaces with a CMOS platform

Author: Li, Linsen, Santis, Lorenzo De, Harris, Isaac B. W., Chen, Kevin C., Gao, Yihuai, Christen, Ian, Choi, Hyeongrak, Trusheim, Matthew, Song, Yixuan, Errando-Herranz, Carlos, Du, Jiahui, Hu, Yong, Clark, Genevieve, Ibrahim, Mohamed I., Gilbert, Gerald, Han, Ruonan, Englund, Dirk

Issue&Volume: 2024-05-29

Abstract: Colour centres in diamond have emerged as a leading solid-state platform for advancing quantum technologies, satisfying the DiVincenzo criteria and recently achieving quantum advantage in secret key distribution. Blueprint studies indicate that general-purpose quantum computing using local quantum communication networks will require millions of physical qubits to encode thousands of logical qubits, presenting an open scalability challenge. Here we introduce a modular quantum system-on-chip (QSoC) architecture that integrates thousands of individually addressable tin-vacancy spin qubits in two-dimensional arrays of quantum microchiplets into an application-specific integrated circuit designed for cryogenic control. We demonstrate crucial fabrication steps and architectural subcomponents, including QSoC transfer by means of a ‘lock-and-release’ method for large-scale heterogeneous integration, high-throughput spin-qubit calibration and spectral tuning, and efficient spin state preparation and measurement. This QSoC architecture supports full connectivity for quantum memory arrays by spectral tuning across spin–photon frequency channels. Design studies building on these measurements indicate further scaling potential by means of increased qubit density, larger QSoC active regions and optical networking across QSoC modules.

DOI: 10.1038/s41586-024-07371-7

Source: https://www.nature.com/articles/s41586-024-07371-7