Scalable and High-Fidelity Quantum Random Access Memory in Spin-Photon Networks
Abstract
A quantum random access memory (qRAM) is considered an essential computing unit to enable polynomial speedups in quantum information processing. Proposed implementations include using 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 rely on 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.
Cite
@article{arxiv.2103.07623,
title = {Scalable and High-Fidelity Quantum Random Access Memory in Spin-Photon Networks},
author = {Kevin C. Chen and Wenhan Dai and Carlos Errando-Herranz and Seth Lloyd and Dirk Englund},
journal= {arXiv preprint arXiv:2103.07623},
year = {2021}
}