摘要
本文提出了一个在光腔中利用可控逆非均匀展宽技术实现高效的量子存储方案.当光场在光腔中每次往返的吸收与透射到光腔中光场强度完全一样时(阻抗匹配条件),发现进入光腔中的光场可以完全被非均匀展宽原子系综吸收.通过计算得到无论是向前读取还是向后读取的方案,量子存储效率在光深度很小时都可以达到1.若没有光腔100%的存储效率仅仅只有在光深度无穷大时才能得到.在光深度很小时就能达到高效的量子存储在实验上非常容易实现.因此该方案为实验上实现高效的量子存储提供一个确实可行的方法.
We propose an efficient quantum memory scheme with controlled reversible inhomogeneous broadening in an optical cavity. When the absorption per cavity round trip exactly matches the transmission of the coupling mirror （impedance matching condition）, we show that the input light field can be completely absorbed by an inhomogeneous broadening atomic ensemble. From calculation we obtain that either a forward or a backward retrieval process the quantum memory efficiency can reach unity even for a small optical depth of the atomic system. If there is no cavity, 100~//00 efficiency is obtained only for extremely large optical depth. A high efficiency for the quantum memory at a small optical depth is easily achieved in practice. Therefore our proposal offers promising possibilities for the practical realization of high quantum memory efficiency.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2013年第6期727-731,共5页
Acta Photonica Sinica
基金
国家自然科学基金(No.11074190)
浙江省自然科学基金(Nos.Y6090529
LY12A05001)
浙江省教育厅基金(No.Y201120838)资助
关键词
光量子态存储
CRIB技术
阻抗匹配
Quantum memory
Controlled reversible inhomogeneous broadening
Impedance matching
