Experimental Demonstration of Coherent Optical Storage via Precreated Macroscopic Coherence in Eu 3+ :Y 2 SiO 5
Zhenqi Xu, Mucheng Guo, Zhehao Xu, Weiye Sun, Pengjun Liang, Zongquan Zhou, Shuping Liu, Fudong Wang, Manjin ZhongABSTRACT
We report the first experimental realization of phase‐preserving optical storage based on the pre‐created long‐lived macroscopic coherence (PLMC) protocol in a : crystal. In contrast to conventional photon‐echo schemes that rely on population‐based initialization, this protocol exploits a pre‐established macroscopic spin coherence as the functional resource for optical storage and retrieval. We successfully observe the photon echo signal governed by the PLMC and achieve a fidelity of coherence preservation of for single‐pulse input and for two‐pulse inputs. Crucially, we implement an active noise suppression scheme based on Stark modulation, which effectively eliminates parasitic coherent emissions and enhances the signal‐to‐noise ratio. These results establish macroscopic coherence as a practical resource for robust coherent optical storage, and provide a pathway toward high‐performance quantum memories for scalable quantum communication and network applications.