Optical quantum memory, the ability to store photonic quantum states and retrieve them on demand, is an essential resource for emerging quantum technologies and photonic quantum information protocols. Simultaneously achieving high efficiency and high-speed, broadband operation is an important task necessary for enabling these applications. We investigate the optimization of a large class of optical quantum memories based on resonant and near-resonant interaction with ensembles of $\mathrm{\Lambda }$-type level systems with the restriction that the temporal envelope of all optical fields must be Gaussian, which reduces experimental complexity. Through this optimization we demonstrate an experimentally simple path to saturation of the protocol-independent storage efficiency bound that is valid for a wide range of memory bandwidths, including those that are broadband and high speed. Examining the resulting optimal Gaussian control field parameters, we find a continuous transformation between three physically distinct resonant quantum memory protocols. We compare this Gaussian optimization scheme with standard shape-based optimization.

中文翻译：

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使用高斯脉冲优化宽带Λ型量子存储器

光量子存储器具有存储光子量子态并按需检索它们的能力，是新兴量子技术和光子量子信息协议的重要资源。同时实现高效率和高速、宽带操作是实现这些应用所必需的重要任务。我们研究了基于与集合的共振和近共振相互作用的一大类光量子存储器的优化$\mathrm{\Lambda }$型能级系统的限制是所有光场的时间包络必须是高斯分布，这降低了实验的复杂性。通过这种优化，我们展示了一个实验性的简单路径，使协议无关的存储效率边界达到饱和，该边界适用于广泛的内存带宽，包括宽带和高速带宽。检查由此产生的最佳高斯控制场参数，我们发现三个物理上不同的共振量子存储器协议之间的连续转换。我们将这种高斯优化方案与标准的基于形状的优化方案进行比较。