Scalable and High-Fidelity Quantum Random Access Memory in Spin-Photon Networks
Scalable and High-Fidelity Quantum Random Access Memory in Spin-Photon Networks
复制标题
DOI：
10.1103/prxquantum.2.030319
复制
发表时间：
2021-08-03
期刊：
影响因子：
9.7
通讯作者：
Englund, D.
中科院分区：
文献类型：
--
作者：
Chen, K. C.;Dai, W.;Englund, D.
量子随机存取存储器（qRAM）被认为是量子信息处理中实现多项式加速的基本计算单元。建议的实现包括使用中性原子和超导电路来构建二叉树，但这些系统仍然需要基本组件的演示。在这里，我们提出了一个集成了固态存储器的光子集成电路（PIC）架构，作为构建qRAM的可行平台。我们还提出了一种基于量子隐形传态的替代方案，并将其扩展到量子网络的环境中。这两种实现都实现了两个关键的qRAM操作，(1)量子态转移和(2)量子路由，使用已经演示的组件：电光调制器，马赫-曾德干涉仪（MZI）网络，以及耦合到人工原子的纳米腔，用于基于自旋的存储器写入和检索。我们的方法进一步受益于基于光子预警的内置错误检测。对qRAM效率和查询保真度的详细理论分析表明，我们的建议为通用qRAM提供了可行的近期设计。
A quantum random access memory (qRAM) is considered an essential computing unit to enable polynomial speedups in quantum information processing. Proposed implementations include the use of neutral atoms and superconducting circuits to construct a binary tree but these systems still require demonstrations of the elementary components. Here, we propose a photonic-integrated-circuit (PIC) architecture integrated with solid-state memories as a viable platform for constructing a qRAM. We also present an alternative scheme based on quantum teleportation and extend it to the context of quantum networks. Both implementations realize the two key qRAM operations, (1) quantum state transfer and (2) quantum routing, with already demonstrated components: electro-optic modulators, a Mach-Zehnder interferometer (MZI) network, and nanocavities coupled to artificial atoms for spin-based memory writing and retrieval. Our approaches furthermore benefit from built-in error detection based on photon heralding. Detailed theoretical analysis of the qRAM efficiency and query fidelity shows that our proposal presents viable near-term designs for a general qRAM.