论文标题
基于电磁诱导的透明度的宽带相干光学记忆
Broadband coherent optical memory based on electromagnetically induced transparency
论文作者
论文摘要
量子记忆，可以按需存储和检索光子量子状态的设备，是可扩展量子技术的必不可少的组成部分。希望将内存推向宽带制度以提高数据速率。在这里，我们介绍了基于电磁诱导的透明度（EIT）方案的宽带光学记忆的理论和实验研究。我们首先就可以实现宽带EIT内存的问题和要求提供了理论分析。然后，我们介绍了对宽带或短脉冲制度的冷原子中EIT记忆的实验努力。脉搏持续时间为30 ns（对应于14.7 MHz的带宽），脉搏持续时间约为80％。受控制梁的可用强度的限制，我们无法对较短的脉冲进行最佳存储，但仍获得大于50％的效率，脉冲持续时间为14 ns（31.4 MHz）。效率为50％的效率为1267。
Quantum memories, devices that can store and retrieve photonic quantum states on demand, are essential components for scalable quantum technologies. It is desirable to push the memory towards the broadband regime in order to increase the data rate. Here, we present a theoretical and experimental study on the broadband optical memory based on electromagnetically-induced-transparency (EIT) protocol. We first provide a theoretical analysis on the issues and requirements to achieve a broadband EIT memory. We then present our experimental efforts on EIT memory in cold atoms towards the broadband or short-pulse regime. A storage efficiency of ~ 80 % with a pulse duration of 30 ns (corresponding to a bandwidth of 14.7 MHz) is realized. Limited by the available intensity of the control beam, we could not conduct an optimal storage for the even shorter pulses but still obtain an efficiency of larger than 50 % with a pulse duration of 14 ns (31.4 MHz). The achieved time-bandwidth-product at the efficiency of 50 % is 1267.
