Scalable and High-Fidelity Quantum Random Access Memory in Spin-Photon Networks

• URL: http://arxiv.org/abs/2103.07623v1
• Date: Sat, 13 Mar 2021 05:39:03 GMT
• Title: Scalable and High-Fidelity Quantum Random Access Memory in Spin-Photon Networks
• Authors: Kevin C. Chen and Wenhan Dai and Carlos Errando-Herranz and Seth Lloyd and Dirk Englund
• Abstract summary: A quantum random access memory (qRAM) is considered an essential computing unit to enable speedups in quantum information processing. 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.
• Score: 6.540771405203322
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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