论文标题
基于重新扩增的自发发射优化量子存储器的效率
Optimising the Efficiency of a Quantum Memory based on Rephased Amplified Spontaneous Emission
论文作者
论文摘要
我们研究了召回效率，这是重新放大自发发射（Rase）光学深度的函数，这是一种生成纠缠光的协议。实验是在$^{3} \上进行的！ h_ {4} $ $ \ rightarrow $ $^{1} \！ d_ {2} $在稀土掺杂的水晶pr $^{3+} $中的过渡：y $ _ {2} $ sio $ _ {5} $，使用四个超级级别级别之间的四级回声序列来重现排放。观察到$αL$ = 0.8至2.0范围内的光学深度的重新发射，在合并自旋存储时观察到的最大转化效率为14％。这种效率比先前报道的非经典结果是一个显着的改善，但远远远远不足预测的效率。我们讨论了限制协议性能的可能机制，并提出了克服这些限制的方法。
We studied the recall efficiency as a function of optical depth of rephased amplified spontaneous emission (RASE), a protocol for generating entangled light. The experiments were performed on the $^{3}\! H_{4}$ $\rightarrow$ $^{1}\! D_{2}$ transition in the rare-earth doped crystal Pr$^{3+}$:Y$_{2}$SiO$_{5}$, using a four-level echo sequence between four hyperfine levels to rephase the emission. Rephased emission was observed for optical depths in the range of $αL$ = 0.8 to 2.0 with a maximum rephasing efficiency of 14 % observed while incorporating spin storage. This efficiency is a significant improvement over the previously reported non-classical result but is well short of the predicted efficiency. We discuss the possible mechanisms limiting the protocol's performance, and suggest ways to overcome these limits.
