arXiv 1907.026722019-07-05quant-phnucl-thphysics.atom-phphysics.optics

利用核频率梳系统对$γ$射线回波进行谱控制

Spectral control over $γ$-ray echo using a nuclear frequency comb system

Chia-Jung Yeh, Po-Han Lin, Xiwen Zhang, Olga Kocharovskaya, Wen-Te Liao

备注：: 5 pages, 4 figures

摘要：

从理论上研究了利用核频率梳系统对$γ$射线回波进行两种谱控制的方法。核频率梳系统由处于磁化（超精细分裂）、机械运动（多普勒频移）或两者下的多个核目标组成，即移动和磁化目标。因此，在频域中，$γ$射线的单吸收线分裂成等间距的多条吸收线，形成核频率梳结构。我们分别将频谱整形和动态分裂引入频率梳结构，以优化介质的使用并打破回波效率的理论最大值，即，54%。频谱整形方案导致所需的样品谐振厚度的减少，以实现特别是宽带输入的高回波效率。动态分裂法使两个等效核频率梳系统的回波效率提高到67%。我们还表明，只使用少量的目标就足以获得良好的回波性能，这大大降低了实现的复杂性。我们的结果将量子光学扩展到10 keV区域，并为$γ$射线存储器的发展奠定了基础。

英文摘要：

Two kinds of spectral control over $γ$-ray echo using a nuclear frequency comb system are theoretically investigated. A nuclear frequency comb system is composed of multiple nuclear targets under magnetization (hyperfine splitting), mechanical motion (Doppler shift) or both, namely, moving and magnetized targets. In frequency domain the unperturbed single absorption line of $γ$-ray therefore splits into multiple lines with equal spacing and becomes a nuclear frequency comb structure. We introduce spectral shaping and dynamical splitting to the frequency comb structure respectively to optimize the use of a medium and to break the theoretical maximum of echo efficiency, i.e., 54\%. Spectral shaping scheme leads to the reduction of required sample resonant thickness for achieving high echo efficiency of especially a broadband input. Dynamical splitting method significantly advances the echo efficiency up to 67\% revealed by two equivalent nuclear frequency comb systems. We also show that using only few targets is enough to obtain good echo performance, which significantly eases the complexity of implementation. Our results extend quantum optics to 10keV regime and lay the foundation of the development of $γ$-ray memory.

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