In continuous-variable quantum information processing, it is crucial to develop high-efficiency and broadband quantum memory of squeezed light, which enables the storage of full-bandwidth information. Here, we present a quantum memory of squeezed light with up to 24 MHz bandwidth, which is at least 12 times that of previous narrowband resonant memory systems, via a far-off resonant Raman process. We achieve output squeezing of as high as 1.0 dB with fidelity above 92% and a memory efficiency of 80%, corresponding to an end-to-end efficiency of 64.2%, when input squeezing is 1.6 dB. The lowest excess noise of 0.025 shot-noise-unit in the memory system is estimated by the noisy channel model which is benefited from optimizing quantum memory performance with a backward retrieval strategy. Our results represent a breakthrough in high-performance memory for squeezed states within tens of MHz-level bandwidth, which has potential applications in high-speed quantum information processing.
@article{arxiv.2506.15399,
title = {High-Efficiency Quantum Memory of Full-Bandwidth Squeezed Light},
author = {Jinxian Guo and Meihong Wang and Zeliang Wu and Chenyu Qiao and Fengyi Xu and Xiaoran Zhang and Xiaolong Su and Liqing Chen and Weiping Zhang},
journal= {arXiv preprint arXiv:2506.15399},
year = {2025}
}