Optically Loaded Semiconductor Quantum Memory Register

TL;DR

This paper proposes an optically loaded quantum memory using quantum dot molecules that enables fast, heralded entanglement generation between photonic and solid-state qubits for quantum networking.

Contribution

It introduces a novel device architecture combining self-assembled and gated quantum dots for efficient spin-photon entanglement transfer and long-term quantum information storage.

Findings

Design viability confirmed by Poisson-Schroedinger simulations

Device can generate heralded entangled states rapidly

Provides a method for fast reset after failure

Abstract

We propose and analyze an optically loaded quantum memory exploiting capacitive coupling between self-assembled quantum dot molecules and electrically gated quantum dot molecules. The self-assembled dots are used for spin-photon entanglement, which is transferred to the gated dots for long-term storage or processing via a teleportation process heralded by single-photon detection. We illustrate a device architecture enabling this interaction and we outline its operation and fabrication. We provide self-consistent Poisson-Schroedinger simulations to establish the design viability and refine the design, and to estimate the physical coupling parameters and their sensitivities to dot placement. The device we propose generates heralded copies of an entangled state between a photonic qubit and a solid-state qubit with a rapid reset time upon failure. The resulting fast rate of entanglement generation is of high utility for heralded quantum networking scenarios involving lossy optical channels.