Quantum memories could benefit many devices in quantum information processing. For a quantum to be useful in real-world applications, the quantum memory must have a high recall efficiency. Here we demonstrate an efficient (up to 80%) spin-storage quantum memory in Er:YSO, using the 4-level rephased amplified spontaneous emission protocol. We show non-classical correlations between the ASE and RASE fields produced by the quantum memory. Also, we demonstrate the storage of 70 temporal modes, with a write time of 150 us, and a storage time of 25 us. Finally, a clear pathway is presented to improve the efficiency, storage time, and mode capacity. Such a device would have applications in quantum networking and measurement-based quantum computing.
@article{arxiv.2409.12503,
title = {Progress towards efficient 4-level photon echo memories},
author = {James Stuart and Kieran Smith and Morgan Hedges and Rose Ahlefeldt and Matthew Sellars},
journal= {arXiv preprint arXiv:2409.12503},
year = {2025}
}