Dressed Gain from the Parametrically Amplified Four-Wave Mixing Process in an Atomic Vapor.
Dressed Gain from the Parametrically Amplified Four-Wave Mixing Process in an Atomic Vapor.
复制标题
原子蒸气中参数放大四波混频过程的修饰增益
DOI：
10.1038/srep15058
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发表时间：
2015-10-14
影响因子：
4.6
通讯作者：
Xiao M
中科院分区：
文献类型：
--
作者：
Zhang Z;Wen F;Che J;Zhang D;Li C;Zhang Y;Xiao M
在热铷原子蒸汽中，从强泵浦激光发出一个前向光锥，我们从理论和实验两方面研究了在三能级“双Λ”结构中具有缀饰效应的非简并参量放大四波混频（PA - FWM）过程。通过将一个弱探测场注入到四波混频的斯托克斯或反斯托克斯通道中，在分别被称为共轭光和探测光的明亮孪生光束中产生了增益过程。然而，泵浦光束的强缀饰效应将极大地影响探测通道和共轭通道中的增益因子，并且不可避免地对诸如两个通道之间的纠缠度和量子噪声降低等量子效应产生影响。我们通过操控原子密度、拉比频率和频率失谐，系统地研究了缀饰增益过程的强度演化。这种缀饰效应也通过对增益峰的奥脱洛 - 汤斯分裂的观测得到了直观证明。这项研究有助于量子信息处理和量子通信的发展。
With a forward cone emitting from the strong pump laser in a thermal rubidium atomic vapor, we investigate the non-degenerate parametrically amplified four-wave mixing (PA-FWM) process with dressing effects in a three-level “double-Λ” configuration both theoretically and experimentally. By seeding a weak probe field into the Stokes or anti-Stokes channel of the FWM, the gain processes are generated in the bright twin beams which are called conjugate and probe beams, respectively. However, the strong dressing effect of the pump beam will dramatically affect the gain factors both in the probe and conjugate channels, and can inevitably impose an influence on the quantum effects such as entangled degree and the quantum noise reduction between the two channels. We systematically investigate the intensity evolution of the dressed gain processes by manipulating the atomic density, the Rabi frequency and the frequency detuning. Such dressing effects are also visually evidenced by the observation of Autler-Townes splitting of the gain peaks. The investigation can contribute to the development of quantum information processing and quantum communications.