摘要
本文提出了一个利用光子回声技术探究非均匀展宽频谱线形(如高斯、洛伦兹分布)对存储效率影响的简捷方法。我们发现当信号光脉冲的持续时间与介质频谱线宽的乘积远大于1时,可将分布函数的傅里叶变换近似成狄拉克函数,使得研究非均匀展宽频谱对存储效率的影响变得非常容易;通过计算发现不同线形分布达到最佳存储效率的光学深度有所不同,频谱线形趋于均匀时达到最优存储效率的存储介质光学深度最小。该研究对实验上实现最优化光量子态存储具有指导意义。
We proposed an idea to study the influence of the inhomogeneous broadening spectral distributions （such as Gaussian distribution, Lorentzian distribution） on photon-echo-based quantum memory efficiency. We showed that if γτ≥1,γ is the atomic bandwidth and τ represents the duration of the signal pulse, Fourier transform of the distributions approximately acts as a delta function resulting in the analyze of the spectral distributions easily. From calculation,we also showed that if the distribution functions are close to uniform, the minimum optical depth is needed to attain the maximal memory efficiency. The investigation has an instructive meaning to experimentally realize the optimal quantum memory.
出处
《量子光学学报》
CSCD
北大核心
2014年第3期197-201,共5页
Journal of Quantum Optics
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)
温州大学研究生创新基金(No.31606036010185)
