A bucket-brigade quantum random access memory

doi:10.1038/s41567-026-03218-2

2026-03-16

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DOI：10.1038/s41567-026-03218-2

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量子随机访问存储器（QRAM）能够使量子计算机高效访问经典数据，并且是实现许多量子算法获得量子加速的先决条件。尽管存在各种方案，但QRAM的实验实现并不多。在此，我们使用超导量子处理器来实现基于电路的传 Bucket-brigade QRAM，该方案利用量子路由器的二叉树来使存储信息的有效寻址成为可能。为便于实验实现，我们引入了一种量子路由器的高效门分解方案，与传统的受控SWAP实现相比，该方法有效降低了QRAM电路的深度。我们进一步提出了一种误差缓解方法以提高QRAM的查询保真度。通过这些技术，我们能够实验实现用于寻址四个和八个经典位的QRAM架构，分别实现了高达0.809 ± 0.025和0.604 ± 0.005的查询保真度。此外，我们研究了误差传播机制和我们的QRAM实现的扩展性，这为传 Bucket-brigade 架构的噪声鲁棒性提供了实验证据。我们的结果表明，超导量子处理器在实现可扩展的QRAM架构方面具有潜力。随机访问存储器具有多个数据寄存器，并使用地址来指定应读取或修改哪个寄存器。现在，一种使用量子地址返回叠加态数据的量子随机访问存储器已被演示。

Keyword:

Physics

Quantum physics

general

Theoretical

Mathematical and Computational Physics

Classical and Continuum Physics

Atomic

Molecular

Optical and Plasma Physics

Condensed Matter Physics

Complex Systems

期刊

Nature Physics

IF:

18.4

论文数:

6.8K

被引数:

5.7W

机构

Zhejiang University

学者数:

1.5W

论文数: 5.2K

被引数: 17.8W

China Mobile Software Technology

学者数:

论文数: 1

被引数: 0

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