Park Jiho, Jeong Taek, Moon Han Seb
Department of Physics, Pusan National University, Geumjeong-Gu, Busan, 46241, South Korea.
Sci Rep. 2020 Oct 2;10(1):16413. doi: 10.1038/s41598-020-73610-2.
We investigate the spectral-temporal biphoton waveforms of the photon pairs emitted from cascade-type two-photon-coherent warm Rb atoms via the spontaneous four-wave mixing process in the 5S-5P-5D transition, under the condition of the different detuning frequencies (symmetric detuning conditions of ± 1 GHz) of the pump and coupling lasers relative to the 5P state. In both detuning cases corresponding to ± 1 GHz, the biphoton temporal waveforms and biphoton spectral waveforms of the photon pairs are measured by means of time-resolved coincidence photon counting and stimulated measurements, respectively. Although photon-pairs were generated using opposite detunings, we confirm that the spectral-temporal biphoton waveforms of the photon pairs are very similar. Furthermore, we observe Hong-Ou-Mandel interference with 82% visibility with the two independent heralded single photons.
我们研究了在泵浦激光和耦合激光相对于5P态具有不同失谐频率（±1 GHz的对称失谐条件）的情况下，通过5S-5P-5D跃迁中的自发四波混频过程，级联型双光子相干热Rb原子发射的光子对的光谱-时间双光子波形。在对应于±1 GHz的两种失谐情况下，分别通过时间分辨符合光子计数和受激测量手段测量了光子对的双光子时间波形和双光子光谱波形。尽管使用相反的失谐产生了光子对，但我们证实光子对的光谱-时间双光子波形非常相似。此外，我们观察到两个独立的 heralded 单光子之间的Hong-Ou-Mandel干涉，可见度为82%。
