Wang Dan, Lu Weiqing, Han Jingya, Zhang Yao, Liu Yi, Zhou Haitao, Wu Jinze, Zhang Junxiang
Opt Express. 2023 Nov 6;31(23):38255-38267. doi: 10.1364/OE.501989.
Squeezed light near an atomic resonance is beneficial for efficient atom-light quantum interfaces. It is desirable but challenging to directly generate in atoms due to excess noise from spontaneous emission and reabsorption. Here, we report on the use of energy-level modulation to actively control atomic coherence and interference in degenerate four-wave mixing (DFWM) and then to enhance the DFWM gain process for the generation of near-resonant squeezed twin beams. With this technique, we obtain a -2.6 dB intensity-difference squeezing detuned 100 MHz from the D1 F = 4 to F' = 4 transition of Cs.
原子共振附近的压缩光有利于实现高效的原子 - 光量子接口。由于自发辐射和再吸收产生的过量噪声，直接在原子中产生压缩光是理想的但具有挑战性。在此，我们报告了利用能级调制来主动控制简并四波混频（DFWM）中的原子相干性和干涉，进而增强用于产生近共振压缩孪生光束的DFWM增益过程。通过这种技术，我们在铯原子从D1 F = 4到F' = 4跃迁失谐100 MHz的情况下，获得了-2.6 dB的强度差压缩。
