AI 中文总结
该研究针对稀土掺杂晶体自由空间配置光学深度低的问题，利用化学计量EuCl$_3 \cdot$ 6D$_2$O晶体的高光学密度特性，结合慢光效应实现高效率量子存储，为可扩展固态量子存储提供了可行平台。
AI 中文摘要
稀土掺杂晶体是量子存储的有前景候选材料，但其在自由空间配置中的性能受限于低光学深度。本文展示了在化学计量EuCl$_3 \cdot$ 6D$_2$O晶体中的高效率量子存储，该晶体固有地提供高光学密度，无需腔实施的复杂性。研究表明，在这种高密度机制下，系统表现出显著的慢光类效应，包括色散诱导的回波延迟和与细度相关的回波强度调制。本文开发了一个统一的理论框架，展示了吸收和色散如何协同作用以介导回波产生。实现了经典光的存储效率为42.9%，弱相干脉冲的存储效率为34.4%，慢光存储的效率为90%。这些发现验证了EuCl$_3 \cdot$ 6D$_2$O是一个可靠的平台，为可扩展的固态量子存储建立了可行的途径。
英文摘要
Rare-earth-doped crystals are promising candidates for quantum storage, yet their performance in free-space configurations is fundamentally restricted by low optical depth. Here, we demonstrate high-efficiency quantum storage in a stoichiometric EuCl$_3 \cdot$ 6D$_2$O crystal, which intrinsically provides high optical density without the complexity of cavity implementation. We show that in this high-density regime, the system exhibits significant slow-light-like effects, including dispersion-induced echo delays and finesse-dependent echo intensity modulation. We develop a unified theoretical framework showing how absorption and dispersion work in concert to mediate echo generation. We achieve storage efficiencies of 42.9% for classical light and 34.4% for weak coherent pulses, alongside 90% efficiency for slow-light storage. These findings validate EuCl$_3 \cdot$ 6D$_2$O as a robust platform, establishing a viable pathway for scalable solid-state quantum memory.
Comments14 pages, 8 figures
