Zhang Zhaoyang, Wen Feng, Che Junling, Zhang Dan, Li Changbiao, Zhang Yanpeng, Xiao Min
Key Laboratory for Physical Electronics and Devices of the Ministry of Education &Shaanxi Key Lab of Information Photonic Technique, Xi'an Jiaotong University, Xi'an 710049, China.
Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA &National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
Sci Rep. 2015 Oct 14;5:15058. doi: 10.1038/srep15058.
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.
在热铷原子蒸气中，利用从强泵浦激光发射出的前向锥，我们在理论和实验上研究了三能级“双Λ”构型中具有缀饰效应的非简并参量放大四波混频（PA - FWM）过程。通过将弱探测场注入到FWM的斯托克斯或反斯托克斯通道中，在分别称为共轭光束和探测光束的明亮孪生光束中产生增益过程。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，并且不可避免地会对诸如纠缠度和两个通道之间的量子噪声降低等量子效应产生影响。我们通过操纵原子密度、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。通过观察增益峰的Autler - Townes分裂，也直观地证明了这种缀饰效应。该研究有助于量子信息处理和量子通信的发展。
