Publication Date

2021

Journal or Book Title

PRX Quantum

Abstract

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.

ORCID

Errando-Herranz, Carlos/0000-0001-7249-7392

DOI

https://doi.org/10.1103/PRXQuantum.2.030319

Volume

2

Issue

3

License

UMass Amherst Open Access Policy

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Funder

National Science Foundation Graduate Research Fellowships Program (GRFP); Army Research Laboratory Center for Distributed Quantum Information (CDQI); MITRE Corporation Moonshot program; National Science FoundationNational Science Foundation (NSF); Swedish Research CouncilSwedish Research CouncilEuropean Commission [201900684]; National Science Foundation QII-TAQS for Quantum Machine Learning with Photonics [1936314]

Included in

Other Physics Commons

Share

COinS